| Version: | 1.0.17-18 |
| Title: | RDF Library Bindings in R |
| Date: | 2024-02-23 |
| VignetteBuilder: | knitr |
| Description: | Provides methods to parse, query and serialize information stored in the Resource Description Framework (RDF). RDF is described at https://www.w3.org/TR/rdf-primer/. This package supports RDF by implementing an R interface to the Redland RDF C library, described at https://librdf.org/docs/api/index.html. In brief, RDF provides a structured graph consisting of Statements composed of Subject, Predicate, and Object Nodes. |
| Depends: | R (≥ 3.1.1), methods |
| Imports: | roxygen2 |
| Suggests: | spelling, knitr, testthat, rmarkdown, stringi |
| SystemRequirements: | Mac OSX: redland (>= 1.0.14) ; Linux: librdf0 (>= 1.0.14), librdf0-dev (>= 1.0.14) |
| Collate: | 'redland.R' 'World.R' 'Node.R' 'Statement.R' 'Storage.R' 'Model.R' 'Parser.R' 'Query.R' 'QueryResults.R' 'Serializer.R' 'mergeNamespace_roclet.R' 'redland-package.R' 'util.R' |
| License: | Apache License 2.0 |
| Copyright: | See file (inst/)COPYRIGHTS. |
| BugReports: | https://github.com/ropensci/redland-bindings/issues |
| RoxygenNote: | 7.2.3 |
| URL: | https://github.com/ropensci/redland-bindings/tree/master/R/redland https://github.com/ropensci/redland-bindings/tree/master/R |
| Encoding: | UTF-8 |
| Language: | en-US |
| NeedsCompilation: | yes |
| Packaged: | 2024-02-24 00:22:59 UTC; jones |
| Author: | Matthew B. Jones 
[aut, cre],
Peter Slaughter
[aut],
Jeroen Ooms [aut],
Carl Boettiger
[aut],
Scott Chamberlain
[ctb],
David Beckett [cph],
University of Bristol [cph],
Regents of the University of California [cph] |
| Maintainer: | Matthew B. Jones <jones@nceas.ucsb.edu> |
| Repository: | CRAN |
| Date/Publication: | 2024-02-24 01:10:02 UTC |
A Redland Model object
Description
A Model object is used to store the statements (triples) of an RDF model.
Details
A Model may be created manually by creating Statement and adding
them to the Model using addStatement, or a Model may be read in from a
previously saved file using parseFileIntoModel. Once a Model is created,
it can be queried using Query.
Slots
librdf_modelA redland model object
Methods
Model-initialize: Initialize a Model object
addStatement: Add a Statement object to the Model
freeModel: Free memory used by a librdf model object
See Also
View examples of creating models by viewing the 'redland_overview' vignette: 'vignette("redland_overview")'
redland: redland package
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
A Redland Node, used to store one node in an RDF triple statement.
Description
A Node represents a RDF Resource, Property, Literal or an RDF blank Node.
Slots
librdf_nodeA redland node object
Methods
Node-initialize: Initialize a Node object.
getNodeType: Determine the node type and return as a string.
getNodeValue: Determine the node type and return as a string.
getBlankNodeId: Get the value of the node as a string.
See Also
redland: redland package
Examples
world <- new("World")
# a blank node is created with a unique identifier generated by librdf
node <- new("Node", world)
# a blank node is created with a unique identifier generated by librdf
node <- new("Node", world, blank=NULL)
# a blank node is created with the user specified identifier, i.e. "_:id1"
node <- new("Node", world, blank="someid")
# a node type of 'literal' is created
node <- new("Node", world, literal="A Node Value")
# a Node type of 'resource' is created
node <- new("Node", world, uri="http://www.example.com")
# Create a literal node, specifying a language encoding
node <- new("Node", world, literal="Gérard de La Martinière", language="fr")
An RDF Parser object
Description
The Parser class provides methods to parse RDF content into a Redland RDF model.
Slots
librdf_parserA redland parser object
Methods
Parser-initialize: Initialize a Parser object.
parseFileIntoModel: Parse the contents of a file into a model.
freeParser: Free memory used by a librdf parser.
See Also
redland: redland package
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
# Create the default "rdfxml" parser
parser <- new("Parser", world)
filePath <- system.file("extdata/example.rdf", package="redland")
parseFileIntoModel(parser, world, filePath, model)
Query an RDF model
Description
The Query class is used to execute a query on a Model object using the default query language SPARQL. For more information, please refer to https://librdf.org/rasqal/ for details on supported query languages.
Details
A Query is executed using the executeQuery method, which returns a QueryResults object that can be iterated over the query solution sequence.
Slots
librdf_queryA redland query object
librdf_worldA redland world object
Methods
Query-initialize: Initialize a Query object.
executeQuery: Execute a query.
setQueryResultLimit: Set limit on returned query results.
getQueryResultLimit: Get the query result limit.
getResults: Return all query results.
writeResults: Write query results to a file.
freeParser: Free memory used by a librdf query.
References
www.example.com
See Also
redland: redland package
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
stmt <- new("Statement", world=world,
subject="https://cn.dataone.org/cn/v1/resolve/urn:uuid:274a0c5c-3082-4562-bbd3-2b1288768cac",
predicate="http://www.w3.org/ns/prov#hadPlan",
object="https://cn.dataone.org/cn/v1/resolve/urn:uuid:01305f45-f22b-40c8-8d27-00357d01e4a5")
status <- addStatement(model, stmt)
stmt <- new("Statement", world=world,
subject="https://orcid.org/0000-0002-2192-403X",
predicate="http://www.w3.org/ns/prov#Agent",
object="slaughter",
objectType="literal",
datatype_uri="http://www.w3.org/2001/XMLSchema#string")
status <- addStatement(model, stmt)
queryString <-
paste("PREFIX orcid: <https://orcid.org/>",
"PREFIX dataone: <https://cn.dataone.org/cn/v1/resolve/>",
"PREFIX prov: <http://www.w3.org/ns/prov#>",
"SELECT ?a ?c WHERE { ?a prov:Agent ?c . }", sep=" ")
query <- new("Query", world, queryString, base_uri=NULL, query_language="sparql", query_uri=NULL)
# Return all results as a string
results <- getResults(query, model, "rdfxml")
A Redland QueryResults object is used to inspect query results from a Query object.
Description
The QueryResults object contains the RDF statements that were returned from a query on an RDF model.
Slots
librdf_query_resultsA redland query object
Methods
QueryResults-initialize: Initialize a QueryResults object.
freeQueryResults: Free memory used by a librdf query result.
See Also
redland: redland package
An RDF Serializer object.
Description
The Serializer class provides methods to convert a Model object to other forms, for example, write out a Model to a file.
Slots
librdf_serializerA redland statement object
Methods
Serializer-initialize: Initialize a Serializer object.
setNameSpace: Set a namespace for the serializer.
serializeToCharacter: Serialize a model to a character vector.
serializeToFile: Serialize a model to a file.
freeSerializer: Free memory used by a librdf serializer.
See Also
redland: redland package
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
filePath <- system.file("extdata/example.rdf", package="redland")
parser <- new("Parser", world)
parseFileIntoModel(parser, world, filePath, model)
# Creat the default "rdfxml" serizlizer
serializer <- new("Serializer", world)
# Add a namespace definition to the serializer
status <- setNameSpace(serializer, world, namespace="http://purl.org/dc/elements/1.1/", prefix="dc")
rdf <- serializeToCharacter(serializer, world, model, baseUri="")
An RDF Statement object
Description
A Statement object is created using the provided subject, predicate and object.
Details
A Statement object can be created from Node objects that are provided for the subject,
predicate and object. An alternative way to create a Statement object is to provide the
subject, predicate and object as character values. If this later method is used, the character values will be evaluated to
determine the appropriate RDF type for the subject and object. Note that the RDF type for the predicate will always
be 'uri' (aka 'resource'). If the automatic determination of RDF types is not desired, then the subjectType and
objectType parameters can be specified to explicitly set the RDF types.
Slots
librdf_statementA redland statement object
Methods
Statement-initialize: Initialize a Statement object.
getTermType: Return the redland node type for the specified RDF term in a statement.
freeStatement: Free memory used by a librdf statement.
See Also
redland: redland package
Examples
world <- new("World")
# Create nodes manually and add to the statment
subject <- new("Node", blank="_:myid1", world)
predicate <- new("Node", uri="http://www.example.com/isa", world)
object <- new("Node", literal="thing", world)
stmt <- new("Statement", world, subject, predicate, object)
# Create the statement specifying node values directly
stmt <- new("Statement", world, subject="http://www.example.com/myevent",
predicate="http://example.com/occurredAt",
object="Tue Feb 17 14:05:13 PST 2015")
stmt <- new("Statement", world, subject=NULL,
predicate="http://www.example.com/hasAddr",
object="http://www.nothing.com", objectType="literal")
stmt <- new("Statement", world, subject="http://www.example.com/BobSmith",
predicate="http://www.example.com/says",
object="¡Hola, amigo! ¿Cómo estás?",
objectType="literal",
language="es")
A Redland Storage object
Description
A Redland Storage object
Slots
librdf_storageA redland storage object
typethe storage type to create, i.e. "hashes", "mysql", "postgresql", ...
Methods
Storage-initialize: Initialize a Storage object
freeStorage: Free memory used by a librdf storage object
See Also
redland: redland package
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
A Redland World object, used to initialize the Redland RDF library.
Description
A World object is the top level object in the Redland RDF library implementation, so it contains all other objects needed to process RDF Models.
Slots
librdf_worldA redland world object
Methods
World-initialize: Initialize a World object
freeWorld: Free memory used by a librdf world object
See Also
redland: redland package
Examples
world <- new("World")
Assign values in a list of ExternalReferences
Description
Assign values in a list of ExternalReferences
Usage
## S4 replacement method for signature 'ExternalReference'
x[i, j, ...] <- value
Arguments
x |
a list of ExternalReferences |
i |
row subscript |
j |
column subscript |
... |
additional arguments |
value |
a value to assign |
Subset a list of ExternalReferences
Description
Subset a list of ExternalReferences
Usage
## S4 method for signature 'ExternalReference'
x[i, j, ..., drop = TRUE]
Arguments
x |
a list of ExternalReferences |
i |
row subscript |
j |
column subscript |
... |
additional arguments |
drop |
a logical |
Add a Statement object to the Model
Description
Add a Statement object to the Model
Usage
addStatement(.Object, statement)
## S4 method for signature 'Model,Statement'
addStatement(.Object, statement)
Arguments
.Object |
a Model object |
statement |
the Statement that will be added |
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
Execute a query
Description
The initialize query is executed and the result is returned as a QueryResult object
Usage
executeQuery(.Object, model)
## S4 method for signature 'Query'
executeQuery(.Object, model)
Arguments
.Object |
a Query object |
model |
a Model object containing the statements to query |
Value
a QueryResults object
Free memory used by a librdf model.
Description
Free memory used by a librdf model.
Usage
freeModel(.Object)
## S4 method for signature 'Model'
freeModel(.Object)
Arguments
.Object |
a Model object |
Details
After this method is called, the Model object is no longer usable and should
be deleted "rm(model)" and a new object created.
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
# At this point, some operations would be performed with the model.
# See '?redland' for a complete example.
# When the Model object is no longer needed, the resources it has allocated can be freed.
freeModel(model)
rm(model)
Free memory used by a librdf parser
Description
Free memory used by a librdf parser
Usage
freeParser(.Object)
## S4 method for signature 'Parser'
freeParser(.Object)
Arguments
.Object |
a Node object |
Details
After freeNode is called, the Node object is no longer usable and should
be deleted "rm(nodeName)" and a new object created.
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
parser <- new("Parser", world)
filePath <- system.file("extdata/example.rdf", package="redland")
parseFileIntoModel(parser, world, filePath, model)
# At this point, some operations would be performed with the Model that has been populated
# with the parser.
# See '?redland' for a complete example.
# When the parser object is no longer needed, the resources it had allocated can be freed.
freeParser(parser)
rm(parser)
Free memory used by a librdf query
Description
Free memory used by a librdf query
Usage
freeQuery(.Object)
## S4 method for signature 'Query'
freeQuery(.Object)
Arguments
.Object |
a Query object |
Details
After this method is called, the Query object is no longer usable and should
be deleted "rm(query)" and a new object created.
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
stmt <- new("Statement", world=world,
subject="https://orcid.org/0000-0002-2192-403X",
predicate="http://www.w3.org/ns/prov#Agent",
object="slaughter",
objectType="literal", datatype_uri="http://www.w3.org/2001/XMLSchema#string")
status <- addStatement(model, stmt)
queryString <- paste("PREFIX orcid: <https://orcid.org/>",
"PREFIX dataone: <https://cn.dataone.org/cn/v1/resolve/>",
"PREFIX prov: <http://www.w3.org/ns/prov#>",
"SELECT ?a ?c WHERE { ?a prov:Agent ?c . }", sep=" ")
query <- new("Query", world, queryString, base_uri=NULL,
query_language="sparql", query_uri=NULL)
# Return all results as a string
results <- getResults(query, model, "rdfxml")
# When the query object is no longer needed, the resources it had allocated can be freed.
freeQuery(query)
rm(query)
Free memory used by a librdf query results
Description
After this method is called, the QueryResults object is no longer usable and should
be deleted with "rm(query)".
Usage
freeQueryResults(.Object)
## S4 method for signature 'QueryResults'
freeQueryResults(.Object)
Arguments
.Object |
a QueryResults object |
Free memory used by a librdf serializer.
Description
Free memory used by a librdf serializer.
Usage
freeSerializer(.Object)
## S4 method for signature 'Serializer'
freeSerializer(.Object)
Arguments
.Object |
a Serializer object |
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
filePath <- system.file("extdata/example.rdf", package="redland")
parser <- new("Parser", world)
parseFileIntoModel(parser, world, filePath, model)
# Creat the default "rdfxml" serizlizer
serializer <- new("Serializer", world)
# At this point, some operations would be performed with the Serializer object.
# See '?Serializer' for a complete example.
# When the serializer object is no longer needed, the resources it had allocated can be freed.
freeSerializer(serializer)
rm(serializer)
Free memory used by a librdf statement
Description
Free memory used by a librdf statement
Usage
freeStatement(.Object)
## S4 method for signature 'Statement'
freeStatement(.Object)
Arguments
.Object |
a Statement object |
Details
After this method is called, the Statement object is no longer usable and should
be deleted "rm(statement)" and a new object created. This method frees
all resources for the statement, as well as each node in the statement.
Examples
world <- new("World")
stmt <- new("Statement", world, subject="http://www.example.com/myevent",
predicate="http://example.com/occurredAt",
object="Tue Feb 17 14:05:13 PST 2015")
# At this point, some operations would be performed with the Statement.
# See '?redland' for a complete example.
# When the Statement object is no longer needed, the resources it had allocated can be freed.
freeStatement(stmt)
rm(stmt)
Free memory used by a librdf storage object
Description
After this method is called, the Storage object is no longer usable and should
be deleted "rm(storage)" and a new object created.
Usage
freeStorage(.Object)
## S4 method for signature 'Storage'
freeStorage(.Object)
Arguments
.Object |
a Storage object to free memory for |
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
# At this point we would perform some operations using the storage object.
# See '?redland' for a complete example.
# When the Storage object is no longer needed, the resources it had allocated can be freed.
status <- freeStorage(storage)
rm(storage)
Free memory used by a librdf world object
Description
Free memory used by a librdf world object
Usage
freeWorld(.Object)
## S4 method for signature 'World'
freeWorld(.Object)
Arguments
.Object |
a World object |
Details
After this method is called, the World object is no longer usable and should
be deleted "rm(world)" and a new object created.
Examples
world <- new("World")
# At this point we would perform some operations using the world object.
# When the world object is no longer needed, we can free the resources it has allocated.
result <- freeWorld(world)
rm(world)
Get the blank identifier that has been assigned for a specified Node object
Description
Get the blank identifier that has been assigned for a specified Node object
Usage
getBlankNodeId(.Object)
## S4 method for signature 'Node'
getBlankNodeId(.Object)
Arguments
.Object |
a Node object |
Details
When a Node object is initialized with no value specified, i.e. node <- Node(""), a blank node is created and a locally unique identifier is generated by librdf. This method retrieves this identifier and returns in to the caller.
Value
a blank node identifier
Examples
world <- new("World")
# a blank node is created with a unique identifier generated by librdf
node <- new("Node", world, blank=NULL)
nodeId <- getBlankNodeId(node)
Determine the node type and return as a string
Description
A Node has a type that is assigned at initialization and can have one of the following values: 'resource', 'literal', 'blank' and 'unknown'.
Usage
getNodeType(.Object)
## S4 method for signature 'Node'
getNodeType(.Object)
Arguments
.Object |
a Node object |
Value
a character vector containing the Node type
Examples
world <- new("World")
node <- new("Node", world, uri="http://www.example.com")
nodeType <- getNodeType(node)
Get the value of the node as a string
Description
Get the value of the node as a string
Usage
getNodeValue(.Object)
## S4 method for signature 'Node'
getNodeValue(.Object)
Arguments
.Object |
a Node object |
Details
The value of the node is returned as a string. If the node type is 'blank', then the blank node identifier is returned. If the node type is 'literal', then the literal value is returned with the form "string@language, e.g. "¡Hola, amigo! ¿Cómo estás?"@es". If the node type is 'uri' then the value is returned as a string.
Value
a string representation of the Node's value
Examples
world <- new("World")
node <- new("Node", world, literal="¡Hola, amigo! ¿Cómo estás?", language="es")
value <- getNodeValue(node)
Get the query result limit
Description
Get the query result limit
Usage
getQueryResultLimit(.Object)
## S4 method for signature 'Query'
getQueryResultLimit(.Object)
Arguments
.Object |
a Query object |
Value
the query result limit. If a limit is set then the value will be >= 0. If the value is < 0, no limit is set
Return all query results
Description
Return all query results
Usage
getResults(.Object, model, ...)
## S4 method for signature 'Query'
getResults(.Object, model, formatName = "rdfxml")
Arguments
.Object |
a Query object |
model |
a Model object |
... |
additional parameters |
formatName |
a string specifying the RDF format name. Currently the supported formats are "rdfxml" ,"turtle", "json", "csv" |
Details
After this method is called, the Query object is no longer usable and should
be deleted "rm(query)" and a new object created.
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
stmt <- new("Statement", world=world,
subject="https://orcid.org/0000-0002-2192-403X",
predicate="http://www.w3.org/ns/prov#Agent",
object="slaughter",
objectType="literal", datatype_uri="http://www.w3.org/2001/XMLSchema#string")
#objectType="literal", language="en")
status <- addStatement(model, stmt)
queryString <- paste("PREFIX orcid: <https://orcid.org/>",
"PREFIX dataone: <https://cn.dataone.org/cn/v1/resolve/>",
"PREFIX prov: <http://www.w3.org/ns/prov#>",
"SELECT ?a ?c WHERE { ?a prov:Agent ?c . }", sep=" ")
query <- new("Query", world, queryString, base_uri=NULL, query_language="sparql", query_uri=NULL)
# Return all results as a string
results <- getResults(query, model, "rdfxml")
results <- getResults(query, model, "turtle")
results <- getResults(query, model, "json")
# When the query object is no longer needed, the resources it had allocated can be freed.
freeQuery(query)
rm(query)
Return the redland node type for the specified RDF term in a statement
Description
After a Statement object has been created, this method can be used to determine the RDF type ("uri", "literal", "blank") that has been assigned to the specified RDF term, i.e. "subject", "predicate", "object".
Usage
getTermType(.Object, term)
## S4 method for signature 'Statement,character'
getTermType(.Object, term)
Arguments
.Object |
a Statement object |
term |
the RDF term for which the type will be returned |
Examples
world <- new("World")
subject <- new("Node", blank="_:myid1", world)
predicate <- new("Node", uri="http://www.example.com/isa", world)
object <- new("Node", literal="thing", world)
stmt <- new("Statement", world, subject, predicate, object, world)
termType <- getTermType(stmt, "predicate")
Constructor for a Model object.
Description
Constructor for a Model object.
Usage
## S4 method for signature 'Model'
initialize(.Object, world, storage, options)
Arguments
.Object |
a Node object |
world |
a World object |
storage |
a Storage object |
options |
extra options for model initialization |
Value
the World object
Initialize a Node object.
Description
A Node has an associated type corresponding to the RDF component that it is representing. The list of possible types is "resource", "literal" or "blank".
Usage
## S4 method for signature 'Node'
initialize(.Object, world, literal, uri, blank, datatype_uri, language)
Arguments
.Object |
the Node object to be initialized |
world |
a World object |
literal |
a literal character value to be assigned to the node |
uri |
a uri character value to be assigned to the node |
blank |
a blank node identifier to be assigned to the node |
datatype_uri |
a uri used to specify the datatype of a literal node, i.e. "http://www.w3.org/2001/XMLSchema#string" |
language |
a character value specifying the RDF language tag (excluding the "@" symbol), i.e. "fr" |
Details
The url=' and 'literal=' arguments determine which type of Node is created. The Node type affects how the Node is processed in serialization, for example a Node created with 'node1 <- new("Node", literal="http://www.example.com")' is processed differently that a Node created with 'node1 <- new("Node", url="http://www.example.com")', with the former being processed as an RDF literal and the latter processed as an RDF resource.
Value
the Node object
Note
Refer to https://www.w3.org/TR/rdf11-concepts information on language tags.
Initialize a Parser object.
Description
A Parser object is initialized for a specific RDF serialization.
Usage
## S4 method for signature 'Parser'
initialize(
.Object,
world,
name = "rdfxml",
mimeType = "application/rdf+xml",
typeUri = as.character(NA)
)
Arguments
.Object |
the Parser object |
world |
a World object |
name |
name of the parser factory to use |
mimeType |
a mime type of the syntax of the model |
typeUri |
a URI for the syntax of the model |
Details
The serialization format that are supported by
Value
the Parser object
Initialize the Query object.
Description
Initialize the Query object.
Usage
## S4 method for signature 'Query'
initialize(
.Object,
world,
querystring,
base_uri = NULL,
query_language = "sparql",
query_uri = NULL
)
Arguments
.Object |
the Query object |
world |
a World object |
querystring |
a query string for the language specified in 'query_language' |
base_uri |
a URI to prepend to relative URI in the document |
query_language |
the query language to execute the querystring with |
query_uri |
a URI to prepend to terms in the query |
Value
the Query object
Initialize the QueryResults object.
Description
The QueryResults object is initialized with the librdf query result from
return value of 'Query.execute()'.
Usage
## S4 method for signature 'QueryResults'
initialize(.Object, results)
Arguments
.Object |
the QueryResults object. |
results |
a librdf query result |
Details
A QueryResults object is returned by the Query.executeQuery() method, so typically a user
does not initialize a QueryResult object by calling new("QueryResult", ...)
Value
the QueryResults object
Construct a Serializer object.
Description
Construct a Serializer object.
Usage
## S4 method for signature 'Serializer'
initialize(
.Object,
world,
name = "rdfxml",
mimeType = "application/rdf+xml",
typeUri = as.character(NA)
)
Arguments
.Object |
the Serializer object |
world |
a World object |
name |
name of a previously created serializer factory to use |
mimeType |
a mime type of the syntax of the model |
typeUri |
a URI for the syntax of the model |
Value
the Serializer object
Construct a Statement object.
Description
Construct a Statement object.
Usage
## S4 method for signature 'Statement'
initialize(
.Object,
world,
subject,
predicate,
object,
subjectType = as.character(NA),
objectType = as.character(NA),
datatype_uri = as.character(NA),
language = as.character(NA)
)
Arguments
.Object |
the Statement object |
world |
a World object |
subject |
a Node object |
predicate |
a Node object |
object |
a Node object |
subjectType |
the Node type of the subject, i.e. "blank", "uri" |
objectType |
the Node type of the object, i.e. "blank", "uri", "literal" |
datatype_uri |
the datatype URI to associate with a object literal value |
language |
a character value specifying the RDF language tag for an object literal value (excluding the "@" symbol), i.e. "fr" |
Value
the Statement object
Initialize a Storage object
Description
Initialize a Storage object
Usage
## S4 method for signature 'Storage'
initialize(
.Object,
world,
type = "hashes",
name = "",
options = "hash-type='memory'"
)
Arguments
.Object |
the Storage object |
world |
the World object |
type |
the Redland storage type |
name |
storage instance name |
options |
storage options |
Value
the Storage object
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
Initialize the World object.
Description
Initialize the World object.
Usage
## S4 method for signature 'World'
initialize(.Object)
Arguments
.Object |
the World object |
Value
the World object
Determine whether an externalptr object is NULL.
Description
The pointer is treated as an externalptr and checked via a call in C to see if it is NULL.
Usage
is.null.externalptr(pointer)
Arguments
pointer |
externalptr to be checked for NULL value |
Value
logical TRUE if the pointer is NULL, otherwise FALSE
Return length of a SWIGArray
Description
Return length of a SWIGArray
Usage
## S4 method for signature 'SWIGArray'
length(x)
Arguments
x |
the SWIGArray |
Copyright string (multiple lines).
Description
Copyright string (multiple lines).
Usage
librdf_copyright_string ( .copy )
Arguments
.copy |
NA |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return Redland RDF copyright string
Description
Return the Redland RDF copyright
Usage
librdf_copyright_string_get (.copy)
Arguments
.copy |
logical |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Finish the digesting of data.
Description
Finish the digesting of data.
Usage
librdf_digest_final ( digest )
Arguments
digest |
the digest ("_p_librdf_digest_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
(Re)initialise the librdf_digest object.
Description
(Re)initialise the librdf_digest object.
Usage
librdf_digest_init ( digest )
Arguments
digest |
the digest ("_p_librdf_digest_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get a string representation of the digest object.
Description
Get a string representation of the digest object.
Usage
librdf_digest_to_string ( digest )
Arguments
digest |
the digest ("_p_librdf_digest_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Add more data to the librdf_digest object.
Description
Add more data to the librdf_digest object.
Usage
librdf_digest_update ( digest,
buf,
length )
Arguments
digest |
the digest ("_p_librdf_digest_s") |
buf |
the data buffer ("character") |
length |
the length of the data ("integer") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Add a string to the librdf_digest object.
Description
Add a string to the librdf_digest object.
Usage
librdf_digest_update_string ( digest,
string )
Arguments
digest |
the digest ("_p_librdf_digest_s") |
string |
string to add ("character") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_digest object.
Description
Destructor - destroy a librdf_digest object.
Usage
librdf_free_digest ( digest )
Arguments
digest |
the digest ("_p_librdf_digest_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_hash object.
Description
Destructor - destroy a librdf_hash object.
Usage
librdf_free_hash ( hash )
Arguments
hash |
hash object ("_p_librdf_hash_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_iterator object.
Description
Destructor - destroy a librdf_iterator object.
Usage
librdf_free_iterator ( s_arg1 )
Arguments
s_arg1 |
the librdf_iterator object ("_p_librdf_iterator_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - Destroy a librdf_model object.
Description
Destructor - Destroy a librdf_model object.
Usage
librdf_free_model ( model )
Arguments
model |
librdf_model model to destroy ("_p_librdf_model_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy an librdf_node object.
Description
Destructor - destroy an librdf_node object.
Usage
librdf_free_node ( r )
Arguments
r |
librdf_node object ("_p_librdf_node_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroys a librdf_parser object.
Description
Destructor - destroys a librdf_parser object.
Usage
librdf_free_parser ( parser )
Arguments
parser |
the parser ("_p_librdf_parser_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_query object.
Description
Destructor - destroy a librdf_query object.
Usage
librdf_free_query ( query )
Arguments
query |
librdf_query object ("_p_librdf_query") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_query_results object.
Description
Destructor - destroy a librdf_query_results object.
Usage
librdf_free_query_results ( query_results )
Arguments
query_results |
librdf_query_results object ("_p_librdf_query_results") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroys a librdf_serializer object.
Description
Destructor - destroys a librdf_serializer object.
Usage
librdf_free_serializer ( serializer )
Arguments
serializer |
the serializer ("_p_librdf_serializer_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_statement.
Description
Destructor - destroy a librdf_statement.
Usage
librdf_free_statement ( statement )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_storage object.
Description
Destructor - destroy a librdf_storage object.
Usage
librdf_free_storage ( storage )
Arguments
storage |
librdf_storage object ("_p_librdf_storage_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy an libdf_stream object.
Description
Destructor - destroy an libdf_stream object.
Usage
librdf_free_stream ( stream )
Arguments
stream |
librdf_stream object ("_p_librdf_stream_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Destructor - destroy a librdf_uri object.
Description
Destructor - destroy a librdf_uri object.
Usage
librdf_free_uri ( uri )
Arguments
uri |
librdf_uri object ("_p_librdf_uri_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Terminate the library and frees all allocated resources.
Description
Terminate the library and frees all allocated resources.
Usage
librdf_free_world ( world )
Arguments
world |
redland world object ("_p_librdf_world_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Format the hash as a string, suitable for parsing by librdf_hash_from_string.
Description
Format the hash as a string, suitable for parsing by librdf_hash_from_string.
Usage
librdf_hash_to_string ( hash,
filter )
Arguments
hash |
librdf_hash object ("_p_librdf_hash_s") |
filter |
NULL terminated list of keys to ignore ("_p_p_char") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
For internal testing, not part of public API
Description
This funciton is for internal testing of the Redland software and is not part of the public API.
Usage
librdf_internal_test_error ( world )
Arguments
world |
librdf_world object ("_p_librdf_world_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
For internal testing, not part of public API
Description
This funciton is for internal testing of the Redland software and is not part of the public API.
Usage
librdf_internal_test_warning ( world )
Arguments
world |
librdf_world ("_p_librdf_world_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Test if the iterator has finished.
Description
Test if the iterator has finished.
Usage
librdf_iterator_end ( iterator,
.copy )
Arguments
iterator |
the librdf_iterator object ("_p_librdf_iterator_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the context of the current object on the iterator.
Description
Get the context of the current object on the iterator.
Usage
librdf_iterator_get_context ( iterator )
Arguments
iterator |
the librdf_iterator object ("_p_librdf_iterator_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the current object from the iterator.
Description
Get the current object from the iterator.
Usage
librdf_iterator_get_object ( iterator )
Arguments
iterator |
the librdf_iterator object ("_p_librdf_iterator_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Move to the next iterator element.
Description
Move to the next iterator element.
Usage
librdf_iterator_next ( iterator,
.copy )
Arguments
iterator |
the librdf_iterator object ("_p_librdf_iterator_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Retrieve error code from log message.
Description
Retrieve error code from log message.
Usage
librdf_log_message_code ( message,
.copy )
Arguments
message |
log message ("_p_librdf_log_message") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Retrieve facility that generated the message.
Description
Retrieve facility that generated the message.
Usage
librdf_log_message_facility ( message,
.copy )
Arguments
message |
log message ("_p_librdf_log_message") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Retrieve severity of log message.
Description
Retrieve severity of log message.
Usage
librdf_log_message_level ( message,
.copy )
Arguments
message |
log message ("_p_librdf_log_message") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Retrieve locator of log entry.
Description
Retrieve locator of log entry.
Usage
librdf_log_message_locator ( message )
Arguments
message |
log message ("_p_librdf_log_message") |
Value
_p_raptor_locator
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Retrieve text message from log entry.
Description
Retrieve text message from log entry.
Usage
librdf_log_message_message ( message )
Arguments
message |
log message ("_p_librdf_log_message") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Create and add a new statement about a resource to the model.
Description
Create and add a new statement about a resource to the model.
Usage
librdf_model_add ( model,
subject,
predicate,
object,
.copy )
Arguments
model |
model object ("_p_librdf_model_s") |
subject |
librdf_node of subject ("_p_librdf_node_s") |
predicate |
librdf_node of predicate ("_p_librdf_node_s") |
object |
librdf_node of object (literal or resource) ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Add a statement to the model.
Description
Add a statement to the model.
Usage
librdf_model_add_statement ( model,
statement,
.copy )
Arguments
model |
model object ("_p_librdf_model_s") |
statement |
statement object ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Add a stream of statements to the model.
Description
Add a stream of statements to the model.
Usage
librdf_model_add_statements ( model,
statement_stream,
.copy )
Arguments
model |
model object ("_p_librdf_model_s") |
statement_stream |
stream of statements to use ("_p_librdf_stream_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Create and add a new statement about a literal to the model.
Description
Create and add a new statement about a literal to the model.
Usage
librdf_model_add_string_literal_statement ( model,
subject,
predicate,
literal,
inStrOrNull,
is_wf_xml,
.copy )
Arguments
model |
model object ("_p_librdf_model_s") |
subject |
librdf_node of subject ("_p_librdf_node_s") |
predicate |
librdf_node of predicate ("_p_librdf_node_s") |
literal |
string literal conten ("character") |
inStrOrNull |
language of literal ("character") |
is_wf_xml |
literal is XML ("integer") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Create and add a new statement about a typed literal to the model.
Description
Create and add a new statement about a typed literal to the model.
Usage
librdf_model_add_typed_literal_statement ( model,
subject,
predicate,
string,
inStrOrNull,
inUriOrNull,
.copy )
Arguments
model |
model object ("_p_librdf_model_s") |
subject |
librdf_node of subject ("_p_librdf_node_s") |
predicate |
librdf_node of predicate ("_p_librdf_node_s") |
string |
string literal content ("character") |
inStrOrNull |
language of literal ("character") |
inUriOrNull |
datatype librdf_uri ("_p_librdf_uri_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
List the model contents as a stream of statements.
Description
List the model contents as a stream of statements.
Usage
librdf_model_as_stream ( model )
Arguments
model |
the model object ("_p_librdf_model_s") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check for a context in the model.
Description
Check for a context in the model.
Usage
librdf_model_contains_context ( model,
context,
.copy )
Arguments
model |
the model object ("_p_librdf_model_s") |
context |
the contest ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check for a statement in the model.
Description
Check for a statement in the model.
Usage
librdf_model_contains_statement ( model,
statement,
.copy )
Arguments
model |
the model object ("_p_librdf_model_s") |
statement |
the statement ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Add a statement to a model with a context.
Description
Add a statement to a model with a context.
Usage
librdf_model_context_add_statement ( model,
context,
statement,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
context |
librdf_node context ("_p_librdf_node_s") |
statement |
librdf_statement statement object ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Add statements to a model with a context.
Description
Add statements to a model with a context.
Usage
librdf_model_context_add_statements ( model,
context,
stream,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
context |
librdf_node context ("_p_librdf_node_s") |
stream |
librdf_stream stream object ("_p_librdf_stream_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
List all statements in a model context.
Description
List all statements in a model context.
Usage
librdf_model_context_as_stream ( model,
context )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
context |
librdf_node context ("_p_librdf_node_s") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Remove a statement from a model in a context.
Description
Remove a statement from a model in a context.
Usage
librdf_model_context_remove_statement ( model,
context,
statement,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
context |
librdf_node context ("_p_librdf_node_s") |
statement |
librdf_statement statement ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Remove statements from a model with the given context.
Description
Remove statements from a model with the given context.
Usage
librdf_model_context_remove_statements ( model,
context,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
context |
librdf_node context ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Find matching statements in the model.
Description
Find matching statements in the model.
Usage
librdf_model_find_statements ( model,
statement )
Arguments
model |
the model object ("_p_librdf_model_s") |
statement |
the partial statement to match ("_p_librdf_statement_s") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Search the model for matching statements in a given context.
Description
Search the model for matching statements in a given context.
Usage
librdf_model_find_statements_in_context ( model,
statement,
inNodeOrNull )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
statement |
librdf_statement partial statement to find ("_p_librdf_statement_s") |
inNodeOrNull |
context librdf_node (or NULL) ("_p_librdf_node_s") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return one arc (predicate) of an arc in an RDF graph given source (subject) and target (object).
Description
Return one arc (predicate) of an arc in an RDF graph given source (subject) and target (object).
Usage
librdf_model_get_arc ( model,
source,
target )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
source |
librdf_node source ("_p_librdf_node_s") |
target |
librdf_node target ("_p_librdf_node_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the arcs (predicates) of an arc in an RDF graph given source (subject) and target (object).
Description
Return the arcs (predicates) of an arc in an RDF graph given source (subject) and target (object).
Usage
librdf_model_get_arcs ( model,
source,
target )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
source |
librdf_node source ("_p_librdf_node_s") |
target |
librdf_node target ("_p_librdf_node_s") |
Value
_p_librdf_iterator_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the properties pointing to the given resource.
Description
Return the properties pointing to the given resource.
Usage
librdf_model_get_arcs_in ( model,
node )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
node |
librdf_node resource node ("_p_librdf_node_s") |
Value
_p_librdf_iterator_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the properties pointing from the given resource.
Description
Return the properties pointing from the given resource.
Usage
librdf_model_get_arcs_out ( model,
node )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
node |
librdf_node resource node ("_p_librdf_node_s") |
Value
_p_librdf_iterator_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the list of contexts in the graph.
Description
Return the list of contexts in the graph.
Usage
librdf_model_get_contexts ( model )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
Value
_p_librdf_iterator_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the value of a graph feature .
Description
Get the value of a graph feature .
Usage
librdf_model_get_feature ( model,
feature )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
feature |
librdf_uri feature property ("_p_librdf_uri_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return one source (subject) of arc in an RDF graph given arc (predicate) and target (object).
Description
Return one source (subject) of arc in an RDF graph given arc (predicate) and target (object).
Usage
librdf_model_get_source ( model,
arc,
target )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
arc |
librdf_node arc ("_p_librdf_node_s") |
target |
librdf_node target ("_p_librdf_node_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the sources (subjects) of arc in an RDF graph given arc (predicate) and target (object).
Description
Return the sources (subjects) of arc in an RDF graph given arc (predicate) and target (object).
Usage
librdf_model_get_sources ( model,
arc,
target )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
arc |
librdf_node arc ("_p_librdf_node_s") |
target |
librdf_node target ("_p_librdf_node_s") |
Value
_p_librdf_iterator_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return one target (object) of an arc in an RDF graph given source (subject) and arc (predicate).
Description
Return one target (object) of an arc in an RDF graph given source (subject) and arc (predicate).
Usage
librdf_model_get_target ( model,
source,
arc )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
source |
librdf_node source ("_p_librdf_node_s") |
arc |
librdf_node arc ("_p_librdf_node_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the targets (objects) of an arc in an RDF graph given source (subject) and arc (predicate).
Description
Return the targets (objects) of an arc in an RDF graph given source (subject) and arc (predicate).
Usage
librdf_model_get_targets ( model,
source,
arc )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
source |
librdf_node source ("_p_librdf_node_s") |
arc |
librdf_node arc ("_p_librdf_node_s") |
Value
_p_librdf_iterator_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check if a node has a given property pointing to it.
Description
Check if a node has a given property pointing to it.
Usage
librdf_model_has_arc_in ( model,
node,
property,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
node |
librdf_node resource node ("_p_librdf_node_s") |
property |
librdf_node property node ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check if a node has a given property pointing from it.
Description
Check if a node has a given property pointing from it.
Usage
librdf_model_has_arc_out ( model,
node,
property,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
node |
librdf_node resource node ("_p_librdf_node_s") |
property |
librdf_node property node ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Load content from a URI into the model.
Description
Load content from a URI into the model.
Usage
librdf_model_load ( model,
uri,
name,
mime_type,
type_uri,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
uri |
the URI to read the content ("_p_librdf_uri_s") |
name |
the name of the parser (or NULL) ("character") |
mime_type |
the MIME type of the syntax (NULL if not used) ("character") |
type_uri |
URI identifying the syntax (NULL if not used) ("_p_librdf_uri_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Execute a query against the model.
Description
Execute a query against the model.
Usage
librdf_model_query_execute ( model,
query )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
query |
librdf_query object ("_p_librdf_query") |
Value
_p_librdf_query_results
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Remove a known statement from the model.
Description
Remove a known statement from the model.
Usage
librdf_model_remove_statement ( model,
statement,
.copy )
Arguments
model |
the model object ("_p_librdf_model_s") |
statement |
the statement ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the value of a graph feature.
Description
Set the value of a graph feature.
Usage
librdf_model_set_feature ( model,
feature,
value,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
feature |
librdf_uri feature property ("_p_librdf_uri_s") |
value |
librdf_node feature property value ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the number of statements in the model.
Description
Get the number of statements in the model.
Usage
librdf_model_size ( model,
.copy )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Synchronise the model to the model implementation.
Description
Synchronise the model to the model implementation.
Usage
librdf_model_sync ( model )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Write serialized model to a string.
Description
Write serialized model to a string.
Usage
librdf_model_to_string ( model,
uri,
name,
mime_type,
inUriOrNull )
Arguments
model |
librdf_model object ("_p_librdf_model_s") |
uri |
base URI to use in serializing (or NULL if not used) ("_p_librdf_uri_s") |
name |
the name of the serializer (or NULL for default) ("character") |
mime_type |
the MIME type of the syntax (NULL if not used) ("character") |
inUriOrNull |
URI identifying the syntax (NULL if not used) ("_p_librdf_uri_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Commit a transaction.
Description
Commit a transaction.
Usage
librdf_model_transaction_commit ( model,
.copy )
Arguments
model |
the model object ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Rollback a transaction.
Description
Rollback a transaction.
Usage
librdf_model_transaction_rollback ( model,
.copy )
Arguments
model |
the model object ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Start a transaction
Description
Start a transaction
Usage
librdf_model_transaction_start ( model,
.copy )
Arguments
model |
the model object ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_digest object.
Description
Constructor - create a new librdf_digest object.
Usage
librdf_new_digest ( world,
name )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
the digest name to use to create this digest ("character") |
Value
_p_librdf_digest_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_hash object.
Description
Constructor - create a new librdf_hash object.
Usage
librdf_new_hash ( world,
name )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
factory name ("character") |
Value
_p_librdf_hash_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_hash object from an array of strings.
Description
Constructor - create a new librdf_hash object from an array of strings.
Usage
librdf_new_hash_from_array_of_strings ( world,
name,
string )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
hash name ("character") |
string |
address of the start of the array of char* pointers ("character") |
Value
_p_librdf_hash_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_hash object from a string.
Description
Constructor - create a new librdf_hash object from a string.
Usage
librdf_new_hash_from_string ( world,
name,
string )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
hash name ("character") |
string |
hash encoded as a string ("character") |
Value
_p_librdf_hash_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new storage librdf_model object.
Description
Constructor - create a new storage librdf_model object.
Usage
librdf_new_model ( world,
storage,
options_string )
Arguments
world |
redland world object ("_p_librdf_world_s") |
storage |
librdf_storage to use ("_p_librdf_storage_s") |
options_string |
options to initialise model ("character") |
Value
_p_librdf_model_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Copy constructor - create a new librdf_model from an existing one.
Description
Copy constructor - create a new librdf_model from an existing one.
Usage
librdf_new_model_from_model ( model )
Arguments
model |
the existing librdf_model ("_p_librdf_model_s") |
Value
_p_librdf_model_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - Create a new librdf_model with storage.
Description
Constructor - Create a new librdf_model with storage.
Usage
librdf_new_model_with_options ( world,
storage,
options )
Arguments
world |
redland world object ("_p_librdf_world_s") |
storage |
librdf_storage storage to use ("_p_librdf_storage_s") |
options |
librdf_hash of options to use ("_p_librdf_hash_s") |
Value
_p_librdf_model_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_node object with a private identifier.
Description
Constructor - create a new librdf_node object with a private identifier.
Usage
librdf_new_node ( world )
Arguments
world |
redland world object ("_p_librdf_world_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new blank node librdf_node object from a blank node identifier.
Description
Constructor - create a new blank node librdf_node object from a blank node identifier.
Usage
librdf_new_node_from_blank_identifier ( world,
inStrOrNull )
Arguments
world |
redland world object ("_p_librdf_world_s") |
inStrOrNull |
UTF-8 encoded blank node identifier or NULL ("character") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new literal librdf_node object.
Description
Constructor - create a new literal librdf_node object.
Usage
librdf_new_node_from_literal ( world,
string,
inStrOrNull,
is_wf_xml )
Arguments
world |
redland world object ("_p_librdf_world_s") |
string |
literal UTF-8 encoded string value ("character") |
inStrOrNull |
literal XML language (or NULL, empty string) ("character") |
is_wf_xml |
non 0 if literal is XML ("integer") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Copy constructor - create a new librdf_node object from an existing librdf_node object.
Description
Copy constructor - create a new librdf_node object from an existing librdf_node object.
Usage
librdf_new_node_from_node ( node )
Arguments
node |
librdf_node object to copy ("_p_librdf_node_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_node object from a UTF-8 encoded URI string normalised to a new base URI.
Description
Constructor - create a new librdf_node object from a UTF-8 encoded URI string normalised to a new base URI.
Usage
librdf_new_node_from_normalised_uri_string ( world,
uri_string,
source_uri,
base_uri )
Arguments
world |
redland world object ("_p_librdf_world_s") |
uri_string |
UTF-8 encoded string representing a URI ("character") |
source_uri |
source URI ("_p_librdf_uri_s") |
base_uri |
base URI ("_p_librdf_uri_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new typed literal librdf_node object.
Description
Constructor - create a new typed literal librdf_node object.
Usage
librdf_new_node_from_typed_literal ( world,
string,
inStrOrNull,
inUriOrNull )
Arguments
world |
redland world object ("_p_librdf_world_s") |
string |
literal UTF-8 encoded string value ("character") |
inStrOrNull |
literal XML language (or NULL, empty string) ("character") |
inUriOrNull |
URI of typed literal datatype or NULL ("_p_librdf_uri_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new resource librdf_node object with a given URI.
Description
Constructor - create a new resource librdf_node object with a given URI.
Usage
librdf_new_node_from_uri ( world,
uri )
Arguments
world |
redland world object ("_p_librdf_world_s") |
uri |
librdf_uri object ("_p_librdf_uri_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new resource librdf_node object with a given URI and local name.
Description
Constructor - create a new resource librdf_node object with a given URI and local name.
Usage
librdf_new_node_from_uri_local_name ( world,
uri,
local_name )
Arguments
world |
redland world object ("_p_librdf_world_s") |
uri |
librdf_uri object ("_p_librdf_uri_s") |
local_name |
local name to append to URI ("character") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_node object from a URI string.
Description
Constructor - create a new librdf_node object from a URI string.
Usage
librdf_new_node_from_uri_string ( world,
string )
Arguments
world |
redland world object ("_p_librdf_world_s") |
string |
string representing a URI ("character") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_parser object.
Description
Constructor - create a new librdf_parser object.
Usage
librdf_new_parser ( world,
name,
mime_type,
type_uri )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
the parser factory name (or NULL or empty string if don't care) ("character") |
mime_type |
the MIME type of the syntax (NULL if not used) ("character") |
type_uri |
URI of syntax (NULL if not used) ("_p_librdf_uri_s") |
Value
_p_librdf_parser_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_query object.
Description
Constructor - create a new librdf_query object.
Usage
librdf_new_query ( world,
name,
uri,
query_string,
base_uri )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
the name identifying the query language ("character") |
uri |
the URI identifying the query language (or NULL) ("_p_librdf_uri_s") |
query_string |
the query string ("character") |
base_uri |
the base URI of the query string (or NULL) ("_p_librdf_uri_s") |
Value
_p_librdf_query
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Copy constructor - create a new librdf_query object from an existing one
Description
Copy constructor - create a new librdf_query object from an existing one
Usage
librdf_new_query_from_query ( old_query )
Arguments
old_query |
the existing query librdf_query to use ("_p_librdf_query") |
Value
_p_librdf_query
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_serializer object.
Description
Constructor - create a new librdf_serializer object.
Usage
librdf_new_serializer ( world,
name,
mime_type,
type_uri )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
the serializer factory name (or NULL or empty string if don't care) ("character") |
mime_type |
the MIME type of the syntax (NULL if not used) ("character") |
type_uri |
URI of syntax (NULL if not used) ("_p_librdf_uri_s") |
Value
_p_librdf_serializer_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new empty librdf_statement.
Description
Constructor - create a new empty librdf_statement.
Usage
librdf_new_statement ( world )
Arguments
world |
redland world object ("_p_librdf_world_s") |
Value
_p_librdf_statement_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_statement from existing librdf_node objects.
Description
Constructor - create a new librdf_statement from existing librdf_node objects.
Usage
librdf_new_statement_from_nodes ( world,
subject,
predicate,
object )
Arguments
world |
redland world object ("_p_librdf_world_s") |
subject |
librdf_node ("_p_librdf_node_s") |
predicate |
librdf_node ("_p_librdf_node_s") |
object |
librdf_node ("_p_librdf_node_s") |
Value
_p_librdf_statement_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Copy constructor - create a new librdf_statement from an existing librdf_statement. Creates a deep copy - changes to original statement nodes are not reflected in the copy.
Description
Copy constructor - create a new librdf_statement from an existing librdf_statement. Creates a deep copy - changes to original statement nodes are not reflected in the copy.
Usage
librdf_new_statement_from_statement ( statement )
Arguments
statement |
librdf_statement to copy ("_p_librdf_statement_s") |
Value
_p_librdf_statement_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_storage object.
Description
Constructor - create a new librdf_storage object.
Usage
librdf_new_storage ( world,
storage_name,
name,
options_string )
Arguments
world |
redland world object ("_p_librdf_world_s") |
storage_name |
the storage factory name ("character") |
name |
an identifier for the storage ("character") |
options_string |
options to initialise storage ("character") |
Value
_p_librdf_storage_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Copy constructor - create a new librdf_storage object from an existing one
Description
Copy constructor - create a new librdf_storage object from an existing one
Usage
librdf_new_storage_from_storage ( old_storage )
Arguments
old_storage |
the existing storage librdf_storage to use ("_p_librdf_storage_s") |
Value
_p_librdf_storage_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_uri object from a URI string.
Description
Constructor - create a new librdf_uri object from a URI string.
Usage
librdf_new_uri ( world,
string )
Arguments
world |
redland world object ("_p_librdf_world_s") |
string |
URI in string form ("character") |
Value
_p_librdf_uri_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Constructor - create a new librdf_uri object from a filename.
Description
Constructor - create a new librdf_uri object from a filename.
Usage
librdf_new_uri_from_filename ( world,
filename )
Arguments
world |
Redland librdf_world object ("_p_librdf_world_s") |
filename |
filename ("character") |
Value
_p_librdf_uri_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Copy constructor - create a new librdf_uri object from an existing librdf_uri object.
Description
Copy constructor - create a new librdf_uri object from an existing librdf_uri object.
Usage
librdf_new_uri_from_uri ( uri )
Arguments
uri |
librdf_uri object ("_p_librdf_uri_s") |
Value
_p_librdf_uri_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Create a new Redland execution environment.
Description
Create a new Redland execution environment.
Usage
librdf_new_world ( )
Value
_p_librdf_world_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Compare two librdf_node objects for equality.
Description
Compare two librdf_node objects for equality.
Usage
librdf_node_equals ( first_node,
second_node,
.copy )
Arguments
first_node |
first librdf_node node ("_p_librdf_node_s") |
second_node |
second librdf_node node ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the blank node identifier as a UTF-8 encoded string.
Description
Get the blank node identifier as a UTF-8 encoded string.
Usage
librdf_node_get_blank_identifier ( node )
Arguments
node |
the node object ("_p_librdf_node_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the node li object ordinal value.
Description
Get the node li object ordinal value.
Usage
librdf_node_get_li_ordinal ( node,
.copy )
Arguments
node |
the node object ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the literal value of the node as a UTF-8 encoded string.
Description
Get the literal value of the node as a UTF-8 encoded string.
Usage
librdf_node_get_literal_value ( node )
Arguments
node |
the node object ("_p_librdf_node_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the string literal value of the node as ISO Latin-1.
Description
Get the string literal value of the node as ISO Latin-1.
Usage
librdf_node_get_literal_value_as_latin1 ( node )
Arguments
node |
the node object ("_p_librdf_node_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the typed literal datatype URI of the literal node.
Description
Get the typed literal datatype URI of the literal node.
Usage
librdf_node_get_literal_value_datatype_uri ( node )
Arguments
node |
the node object ("_p_librdf_node_s") |
Value
_p_librdf_uri_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the XML well-formness property of the node.
Description
Get the XML well-formness property of the node.
Usage
librdf_node_get_literal_value_is_wf_xml ( node,
.copy )
Arguments
node |
the node object ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the XML language of the node.
Description
Get the XML language of the node.
Usage
librdf_node_get_literal_value_language ( node )
Arguments
node |
the node object ("_p_librdf_node_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the type of the node.
Description
Get the type of the node.
Usage
librdf_node_get_type ( node,
.copy )
Arguments
node |
the node object ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the URI for a node object.
Description
Get the URI for a node object.
Usage
librdf_node_get_uri ( node )
Arguments
node |
the node object ("_p_librdf_node_s") |
Value
_p_librdf_uri_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check node is a blank nodeID.
Description
Check node is a blank nodeID.
Usage
librdf_node_is_blank ( node,
.copy )
Arguments
node |
the node object ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check node is a literal.
Description
Check node is a literal.
Usage
librdf_node_is_literal ( node,
.copy )
Arguments
node |
the node object ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check node is a resource.
Description
Check node is a resource.
Usage
librdf_node_is_resource ( node,
.copy )
Arguments
node |
the node object ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check if a parser name is known
Description
Check if a parser name is known
Usage
librdf_parser_check_name ( world,
name,
.copy )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
name of parser ("character") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get an HTTP Accept value for the parser.
Description
Get an HTTP Accept value for the parser.
Usage
librdf_parser_get_accept_header ( parser )
Arguments
parser |
parser ("_p_librdf_parser_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the value of a parser feature.
Description
Get the value of a parser feature.
Usage
librdf_parser_get_feature ( parser,
feature )
Arguments
parser |
librdf_parser object ("_p_librdf_parser_s") |
feature |
librdf_Uuri feature property ("_p_librdf_uri_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the number of namespaces seen during parsing
Description
Get the number of namespaces seen during parsing
Usage
librdf_parser_get_namespaces_seen_count ( parser,
.copy )
Arguments
parser |
librdf_parser object ("_p_librdf_parser_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the prefix of namespaces seen during parsing
Description
Get the prefix of namespaces seen during parsing
Usage
librdf_parser_get_namespaces_seen_prefix ( parser,
offset )
Arguments
parser |
librdf_parser object ("_p_librdf_parser_s") |
offset |
index into list of namespaces ("integer") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the uri of namespaces seen during parsing
Description
Get the uri of namespaces seen during parsing
Usage
librdf_parser_get_namespaces_seen_uri ( parser,
offset )
Arguments
parser |
librdf_parser object ("_p_librdf_parser_s") |
offset |
index into list of namespaces ("integer") |
Value
_p_librdf_uri_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get a parser name for content with type or identifier
Description
Get a parser name for content with type or identifier
Usage
librdf_parser_guess_name2 ( world,
mime_type,
buffer,
identifier )
Arguments
world |
librdf_world object ("_p_librdf_world_s") |
mime_type |
MIME type of syntax or NULL ("character") |
buffer |
content buffer or NULL ("character") |
identifier |
content identifier or NULL ("character") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Parse a URI to a librdf_stream of statements.
Description
Parse a URI to a librdf_stream of statements.
Usage
librdf_parser_parse_as_stream ( parser,
uri,
inUriorNull )
Arguments
parser |
the parser ("_p_librdf_parser_s") |
uri |
the URI to read ("_p_librdf_uri_s") |
inUriorNull |
the base URI to use or NULL ("_p_librdf_uri_s") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Parse a counted string of content to a librdf_stream of statements.
Description
Parse a counted string of content to a librdf_stream of statements.
Usage
librdf_parser_parse_counted_string_as_stream ( parser,
string,
length,
base_uri )
Arguments
parser |
the parser ("_p_librdf_parser_s") |
string |
the string to parse ("character") |
length |
length of the string content (must be >0) ("integer") |
base_uri |
the base URI to use or NULL ("_p_librdf_uri_s") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Parse a counted string of content into an librdf_model.
Description
Parse a counted string of content into an librdf_model.
Usage
librdf_parser_parse_counted_string_into_model ( parser,
string,
length,
base_uri,
model,
.copy )
Arguments
parser |
the parser ("_p_librdf_parser_s") |
string |
the content to parse ("character") |
length |
length of content (must be >0) ("integer") |
base_uri |
the base URI to use or NULL ("_p_librdf_uri_s") |
model |
the model to use ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Parse a URI of content into an librdf_model.
Description
Parse a URI of content into an librdf_model.
Usage
librdf_parser_parse_into_model ( parser,
uri,
inUriOrNull,
model,
.copy )
Arguments
parser |
the parser ("_p_librdf_parser_s") |
uri |
the URI to read the content ("_p_librdf_uri_s") |
inUriOrNull |
the base URI to use or NULL ("_p_librdf_uri_s") |
model |
the model to use ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Parse a string of content to a librdf_stream of statements.
Description
Parse a string of content to a librdf_stream of statements.
Usage
librdf_parser_parse_string_as_stream ( parser,
string,
base_uri )
Arguments
parser |
the parser ("_p_librdf_parser_s") |
string |
the string to parse ("character") |
base_uri |
the base URI to use or NULL ("_p_librdf_uri_s") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Parse a string of content into an librdf_model.
Description
Parse a string of content into an librdf_model.
Usage
librdf_parser_parse_string_into_model ( parser,
string,
base_uri,
model,
.copy )
Arguments
parser |
the parser ("_p_librdf_parser_s") |
string |
the content to parse ("character") |
base_uri |
the base URI to use or NULL ("_p_librdf_uri_s") |
model |
the model to use ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the value of a parser feature.
Description
Set the value of a parser feature.
Usage
librdf_parser_set_feature ( parser,
feature,
value,
.copy )
Arguments
parser |
librdf_parser object ("_p_librdf_parser_s") |
feature |
librdf_uri feature property ("_p_librdf_uri_s") |
value |
librdf_node feature property value ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Run the query on a model.
Description
Run the query on a model.
Usage
librdf_query_execute ( query,
model )
Arguments
query |
librdf_query object ("_p_librdf_query") |
model |
model to operate query on ("_p_librdf_model_s") |
Value
_p_librdf_query_results
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the query-specified limit on results.
Description
Get the query-specified limit on results.
Usage
librdf_query_get_limit ( query,
.copy )
Arguments
query |
librdf_query query object ("_p_librdf_query") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the query-specified offset on results.
Description
Get the query-specified offset on results.
Usage
librdf_query_get_offset ( query,
.copy )
Arguments
query |
librdf_query query object ("_p_librdf_query") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get a query result as an RDF graph in librdf_stream form
Description
Get a query result as an RDF graph in librdf_stream form
Usage
librdf_query_results_as_stream ( query_results )
Arguments
query_results |
librdf_query_results query_results ("_p_librdf_query_results") |
Value
_p_librdf_stream_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Find out if binding results are exhausted.
Description
Find out if binding results are exhausted.
Usage
librdf_query_results_finished ( query_results,
.copy )
Arguments
query_results |
librdf_query_results query results ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get binding name for the current result.
Description
Get binding name for the current result.
Usage
librdf_query_results_get_binding_name ( query_results,
offset )
Arguments
query_results |
librdf_query_results query results ("_p_librdf_query_results") |
offset |
offset of binding name into array of known names ("integer") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get one binding value for the current result.
Description
Get one binding value for the current result.
Usage
librdf_query_results_get_binding_value ( query_results,
offset )
Arguments
query_results |
librdf_query_results query results ("_p_librdf_query_results") |
offset |
offset of binding name into array of known names ("integer") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get one binding value for a given name in the current result.
Description
Get one binding value for a given name in the current result.
Usage
librdf_query_results_get_binding_value_by_name ( query_results,
name )
Arguments
query_results |
librdf_query_results query results ("_p_librdf_query_results") |
name |
variable name ("character") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the number of bound variables in the result.
Description
Get the number of bound variables in the result.
Usage
librdf_query_results_get_bindings_count ( query_results,
.copy )
Arguments
query_results |
librdf_query_results query results ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get boolean query result.
Description
Get boolean query result.
Usage
librdf_query_results_get_boolean ( query_results,
.copy )
Arguments
query_results |
librdf_query_results query_results ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get number of bindings so far.
Description
Get number of bindings so far.
Usage
librdf_query_results_get_count ( query_results,
.copy )
Arguments
query_results |
librdf_query_results query results ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Test if librdf_query_results is variable bindings format.
Description
Test if librdf_query_results is variable bindings format.
Usage
librdf_query_results_is_bindings ( query_results,
.copy )
Arguments
query_results |
librdf_query_results object ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Test if librdf_query_results is boolean format.
Description
Test if librdf_query_results is boolean format.
Usage
librdf_query_results_is_boolean ( query_results,
.copy )
Arguments
query_results |
librdf_query_results object ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Test if librdf_query_results is RDF graph format.
Description
Test if librdf_query_results is RDF graph format.
Usage
librdf_query_results_is_graph ( query_results,
.copy )
Arguments
query_results |
librdf_query_results object ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Test if librdf_query_results is a syntax.
Description
Test if librdf_query_results is a syntax.
Usage
librdf_query_results_is_syntax ( query_results,
.copy )
Arguments
query_results |
librdf_query_results object ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Move to the next result.
Description
Move to the next result.
Usage
librdf_query_results_next ( query_results,
.copy )
Arguments
query_results |
librdf_query_results query results ("_p_librdf_query_results") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Write a query results to a file.
Description
Write a query results to a file.
Usage
librdf_query_results_to_file2 ( query_results,
name,
mime_type,
format_uri,
base_uri,
.copy )
Arguments
query_results |
librdf_query_results object ("_p_librdf_query_results") |
name |
filename to write to ("character") |
mime_type |
mime type (or NULL) ("character") |
format_uri |
URI of syntax to format to (or NULL) ("_p_librdf_uri_s") |
base_uri |
Base URI of output formatted syntax (or NULL) ("_p_librdf_uri_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Turn a query results into a string.
Description
Turn a query results into a string.
Usage
librdf_query_results_to_string2 ( query_results,
name,
mime_type,
format_uri,
base_uri )
Arguments
query_results |
librdf_query_results object ("_p_librdf_query_results") |
name |
format name ("character") |
mime_type |
format mime type (or NULL) ("character") |
format_uri |
URI of syntax to format to (or NULL) ("_p_librdf_uri_s") |
base_uri |
Base URI of output formatted syntax (or NULL) ("_p_librdf_uri_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the query-specified limit on results.
Description
Set the query-specified limit on results.
Usage
librdf_query_set_limit ( query,
limit,
.copy )
Arguments
query |
librdf_query query object ("_p_librdf_query") |
limit |
the limit on results, >=0 to set a limit, <0 to have no limit ("integer") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the query-specified offset on results.
Description
Set the query-specified offset on results.
Usage
librdf_query_set_offset ( query,
offset,
.copy )
Arguments
query |
librdf_query query object ("_p_librdf_query") |
offset |
offset for results, >=0 to set an offset, <0 to have no offset ("integer") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check if a serializer name is known
Description
Check if a serializer name is known
Usage
librdf_serializer_check_name ( world,
name,
.copy )
Arguments
world |
redland world object ("_p_librdf_world_s") |
name |
name of serializer ("character") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the value of a serializer feature.
Description
Get the value of a serializer feature.
Usage
librdf_serializer_get_feature ( serializer,
feature )
Arguments
serializer |
serializer object ("_p_librdf_serializer_s") |
feature |
URI of feature ("_p_librdf_uri_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Write a serialized librdf_model to a file.
Description
Write a serialized librdf_model to a file.
Usage
librdf_serializer_serialize_model_to_file ( serializer,
name,
inUriOrNull,
model,
.copy )
Arguments
serializer |
the serializer ("_p_librdf_serializer_s") |
name |
filename to serialize to ("character") |
inUriOrNull |
the base URI to use (or NULL) ("_p_librdf_uri_s") |
model |
the librdf_model model to use ("_p_librdf_model_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Write a serialized librdf_model to a string. The returned string must be freed by the caller using librdf_free_memory().
Description
Write a serialized librdf_model to a string. The returned string must be freed by the caller using librdf_free_memory().
Usage
librdf_serializer_serialize_model_to_string ( serializer,
inUriOrNull,
model )
Arguments
serializer |
the serializer ("_p_librdf_serializer_s") |
inUriOrNull |
the base URI to use (or NULL) ("_p_librdf_uri_s") |
model |
the librdf_model model to use ("_p_librdf_model_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Write a librdf_stream to a file.
Description
Write a librdf_stream to a file.
Usage
librdf_serializer_serialize_stream_to_file ( serializer,
name,
base_uri,
stream,
.copy )
Arguments
serializer |
the serializer ("_p_librdf_serializer_s") |
name |
filename to serialize to ("character") |
base_uri |
the base URI to use (or NULL) ("_p_librdf_uri_s") |
stream |
the librdf_stream stream to use ("_p_librdf_stream_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Write a librdf_stream to a string.
Description
Write a librdf_stream to a string.
Usage
librdf_serializer_serialize_stream_to_string ( serializer,
base_uri,
stream )
Arguments
serializer |
the serializer ("_p_librdf_serializer_s") |
base_uri |
the base URI to use (or NULL) ("_p_librdf_uri_s") |
stream |
the librdf_stream stream to use ("_p_librdf_stream_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the value of a serializer feature.
Description
Set the value of a serializer feature.
Usage
librdf_serializer_set_feature ( serializer,
feature,
value,
.copy )
Arguments
serializer |
serializer object ("_p_librdf_serializer_s") |
feature |
URI of feature ("_p_librdf_uri_s") |
value |
value to set ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set a namespace URI/prefix mapping.
Description
Set a namespace URI/prefix mapping.
Usage
librdf_serializer_set_namespace ( serializer,
nspace,
prefix,
.copy )
Arguments
serializer |
serializer object ("_p_librdf_serializer_s") |
nspace |
URI of namespace or NULL ("_p_librdf_uri_s") |
prefix |
prefix to use or NULL ("character") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Short copyright string (one line).
Description
Short copyright string (one line).
Usage
librdf_short_copyright_string ( .copy )
Arguments
.copy |
NA |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return Redland librdf copyright string
Description
Return Redland librdf copyright string
Usage
librdf_short_copyright_string_get( .copy )
Arguments
.copy |
logical |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check if two statements are equal.
Description
Check if two statements are equal.
Usage
librdf_statement_equals ( statement1,
statement2,
.copy )
Arguments
statement1 |
first librdf_statement ("_p_librdf_statement_s") |
statement2 |
second librdf_statement ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the statement object.
Description
Get the statement object.
Usage
librdf_statement_get_object ( statement )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the statement predicate.
Description
Get the statement predicate.
Usage
librdf_statement_get_predicate ( statement )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the statement subject.
Description
Get the statement subject.
Usage
librdf_statement_get_subject ( statement )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Check if statement is a complete and legal RDF triple.
Description
Check if statement is a complete and legal RDF triple.
Usage
librdf_statement_is_complete ( statement,
.copy )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Match a statement against a 'partial' statement.
Description
Match a statement against a 'partial' statement.
Usage
librdf_statement_match ( statement,
partial_statement,
.copy )
Arguments
statement |
statement ("_p_librdf_statement_s") |
partial_statement |
statement with possible empty parts ("_p_librdf_statement_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the statement object.
Description
Set the statement object.
Usage
librdf_statement_set_object ( statement,
object )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
object |
librdf_node of object ("_p_librdf_node_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the statement predicate.
Description
Set the statement predicate.
Usage
librdf_statement_set_predicate ( statement,
predicate )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
predicate |
librdf_node of predicate ("_p_librdf_node_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the statement subject.
Description
Set the statement subject.
Usage
librdf_statement_set_subject ( statement,
subject )
Arguments
statement |
librdf_statement object ("_p_librdf_statement_s") |
subject |
librdf_node of subject ("_p_librdf_node_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Test if the stream has ended.
Description
Test if the stream has ended.
Usage
librdf_stream_end ( stream,
.copy )
Arguments
stream |
librdf_stream object ("_p_librdf_stream_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the current librdf_statement in the stream.
Description
Get the current librdf_statement in the stream.
Usage
librdf_stream_get_object ( stream )
Arguments
stream |
librdf_stream object ("_p_librdf_stream_s") |
Value
_p_librdf_statement_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Move to the next librdf_statement in the stream.
Description
Move to the next librdf_statement in the stream.
Usage
librdf_stream_next ( stream,
.copy )
Arguments
stream |
librdf_stream object ("_p_librdf_stream_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Compare two librdf_uri objects lexicographically.
Description
Compare two librdf_uri objects lexicographically.
Usage
librdf_uri_compare ( first_uri,
second_uri,
.copy )
Arguments
first_uri |
librdf_uri object 1 or NULL ("_p_librdf_uri_s") |
second_uri |
librdf_uri object 2 or NULL ("_p_librdf_uri_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Compare two librdf_uri objects for equality.
Description
Compare two librdf_uri objects for equality.
Usage
librdf_uri_equals ( first_uri,
second_uri,
.copy )
Arguments
first_uri |
librdf_uri object 1 ("_p_librdf_uri_s") |
second_uri |
librdf_uri object 2 ("_p_librdf_uri_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Format the URI as a string.
Description
Format the URI as a string.
Usage
librdf_uri_to_string ( uri )
Arguments
uri |
librdf_uri object ("_p_librdf_uri_s") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Library full version as a decimal integer.
Description
Library full version as a decimal integer.
Usage
librdf_version_decimal ( .copy )
Arguments
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return Redland librdf copyright
Description
Return Redland librdf copyright
Usage
librdf_version_decimal_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Library major version number as a decimal integer.
Description
Library major version number as a decimal integer.
Usage
librdf_version_major ( .copy )
Arguments
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the Redland librdf major version number
Description
Return the Redland librdf major version number
Usage
librdf_version_major_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Library minor version number as a decimal integer.
Description
Library minor version number as a decimal integer.
Usage
librdf_version_minor ( .copy )
Arguments
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the Redland librdf minor version number
Description
Return the Redland librdf minor version number
Usage
librdf_version_minor_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Library release version number as a decimal integer.
Description
Library release version number as a decimal integer.
Usage
librdf_version_release ( .copy )
Arguments
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the Redland librdf release version number
Description
Return the Redland librdf release version number
Usage
librdf_version_release_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Library full version as a string.
Description
Library full version as a string.
Usage
librdf_version_string ( .copy )
Arguments
.copy |
NA |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Return the Redland librdf version as a string.
Description
Return the Redland librdf version as a string.
Usage
librdf_version_string_get ( .copy )
Arguments
.copy |
logical |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the value of a world feature.
Description
Get the value of a world feature.
Usage
librdf_world_get_feature ( world,
feature )
Arguments
world |
librdf_world object ("_p_librdf_world_s") |
feature |
librdf_uri feature property ("_p_librdf_uri_s") |
Value
_p_librdf_node_s
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Open a created redland world environment.
Description
Open a created redland world environment.
Usage
librdf_world_open ( world )
Arguments
world |
redland world object ("_p_librdf_world_s") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the value of a world feature.
Description
Set the value of a world feature.
Usage
librdf_world_set_feature ( world,
feature,
value,
.copy )
Arguments
world |
librdf_world object ("_p_librdf_world_s") |
feature |
librdf_uri feature property ("_p_librdf_uri_s") |
value |
librdf_node feature property value ("_p_librdf_node_s") |
.copy |
NA |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Set the world log handling function.
Description
Set the world log handling function.
Usage
librdf_world_set_logger ( world,
user_data,
log_handler )
Arguments
world |
redland world object ("_p_librdf_world_s") |
user_data |
user data to pass to function ("_p_void") |
log_handler |
pointer to the function ("_p_librdf_log_func") |
Value
void
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
A custom Roxygen roclet that adds Redland RDF functions to NAMESPACE file generated by Roxygen.
Description
The redland package uses the SWIG (Simplified Wrapper and Interface Generator) to create the bindings between the Redland RDF C/C++ libraries and R. SWIG creates a NAMESPACE file that contains the function names for the librdf wrapper that it creates, but as of swig 3.0.2 this NAMESPACE file is incorrect and will also be overwritten by Roxygen when 'roxygenize()' or 'devtools:document()' is called, as the wrapper R code doesn't contain Roxygen export annotations used by Roxygen to build the namespace file. To allow for building a NAMESPACE file from all programs in the redland package, this roclet determines the set of wrapper R functions and adds these to the Roxygen generated NAMESPACE file that contains all names from the native R code in the redland package.
Usage
mergeNamespace_roclet(x, ...)
Arguments
x |
a roclet |
... |
additional parameters |
Details
The following line must be present in the DESCRIPTION file for this roclet to be called automatically when 'roxygen2::roxygenize()' or 'devtools::document()' is called:
Roxygen: list(roclets = c("collate", "rd", "namespace", "mergeNamespace_roclet"))
The 'namespace' roclet must always run before the 'mergeNamespace' roclet.
Examples
## Not run:
roxygen2::roxygenize()
devtools::document()
## End(Not run)
Parse the contents of a file into a model
Description
The contents of a the specified file are read and parsed into the initialized Parser object
Usage
parseFileIntoModel(.Object, world, filePath, model, ...)
## S4 method for signature 'Parser,World,character,Model'
parseFileIntoModel(.Object, world, filePath, model, baseUri = as.character(NA))
Arguments
.Object |
a Parser object |
world |
a World object |
filePath |
a file that contains the RDF content |
model |
a Model object to parse the RDF content into |
... |
(Additional parameters) |
baseUri |
a base URI (i.e. XML base) to apply to the model |
Details
The parser factory name specified during initialization determines how the content is parsed, for example, if 'rdfxml' was specified during parser initialization, then the parser expects RDF/XML content as specified in the W3C recommendation (http://www.we3.org/TR/REC-rdf-syntax)
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
# Create the default "rdfxml" parser
parser <- new("Parser", world)
filePath <- system.file("extdata/example.rdf", package="redland")
parseFileIntoModel(parser, world, filePath, model)
Get the locator byte offset from locator.
Description
Get the locator byte offset from locator
Usage
raptor_locator_byte ( locator, .copy )
Arguments
locator |
raptor locator ("_p_raptor_locator") |
.copy |
logical |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get column number from locator
Description
Get column number from locator
Usage
raptor_locator_column ( locator,
.copy )
Arguments
locator |
raptor locator ("_p_raptor_locator") |
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get file name from locator.
Description
Get file name from locator.
Usage
raptor_locator_file ( locator )
Arguments
locator |
raptor locator ("_p_raptor_locator") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get line number from locator.
Description
Get line number from locator.
Usage
raptor_locator_line ( locator, .copy )
Arguments
locator |
raptor locator ("_p_raptor_locator") |
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get URI from locator.
Description
Get URI from locator.
Usage
raptor_locator_uri ( locator )
Arguments
locator |
raptor locator ("_p_raptor_locator") |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Raptor version as a decimal number
Description
Raptor version as a decimal number
Usage
raptor_version_decimal ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Raptor version as a decimal number.
Description
Raptor version as a decimal number.
Usage
raptor_version_decimal_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Raptor library major version
Description
Raptor library major version.
Usage
raptor_version_major ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get Raptor library major version
Description
Get Raptor library major version.
Usage
raptor_version_major_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Raptor library minor version.
Description
Raptor library minor version.
Usage
raptor_version_minor ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get Raptor library minor version.
Description
Get Raptor library minor version.
Usage
raptor_version_minor_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Raptor library release.
Description
Raptor library release.
Usage
raptor_version_release ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Raptor library release.
Description
Get Raptor library release.
Usage
raptor_version_release_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Raptor library version string.
Description
Raptor library version string.
Usage
raptor_version_string ( .copy )
Arguments
.copy |
logical |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get Raptor library version string.
Description
Get Raptor library version string.
Usage
raptor_version_string_get ( .copy )
Arguments
.copy |
logical |
Value
character
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Rasqal version as a decimal number.
Description
Rasqal version as a decimal number.
Usage
rasqal_version_decimal ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the Rasqal version as a decimal number.
Description
Get the Rasqal version as a decimal number.
Usage
rasqal_version_decimal_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Rasqal major version number.
Description
Rasqal major version number.
Usage
rasqal_version_major ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get Rasqal major version number.
Description
Get Rasqal major version number.
Usage
rasqal_version_major_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Rasqal minor version number.
Description
Rasqal minor version number.
Usage
rasqal_version_minor ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the Rasqal minor version number.
Description
Get the Rasqal minor version number.
Usage
rasqal_version_minor_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Rasqal release version number.
Description
Rasqal release version number.
Usage
rasqal_version_release ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the Rasqal release version number.
Description
Get the Rasqal release version number.
Usage
rasqal_version_release_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Rasqal version as a string
Description
Rasqal version as a string.
Usage
rasqal_version_string ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Get the Rasqal version as a string
Description
Get the Rasqal version as a string.
Usage
rasqal_version_string_get ( .copy )
Arguments
.copy |
logical |
Value
integer
References
See Also
This R function is a wrapper function that directly calls the the Redland RDF C libraries. For more information about Redland RDF, view the online documentation indicated in the 'References' section.
Create, query and write RDF graphs.
Description
The R package redland provides methods to create, query and write information stored in the
Resource Description Framework (RDF). This package is implemented as R scripts that provide an
R interface (aka "wrapper") to the Redland RDF C libraries. Documentation for the redland R package classes
and functions are available from the standard R help facility, for example, 'help("Node-class")', '?getNodeType', etc.
An overview of the redland R package is available with the R command: 'vignette("redland_overview")'.
The Redland C library functions are described at https://librdf.org/docs/api/index.html.
An introduction to RDF can be found at https://www.w3.org/TR/rdf-primer/.
Details
The redland R package classes and the corresponding Redland C library types are shown in the following table:
| Concept | Redland C type | redland R class | Purpose |
| Resource / Literal | librdf_node | Node | RDF Model & Syntax nodes |
| Statement / Triple | librdf_statement | Statement | RDF Model & Syntax arcs (statements, triples) |
| Model | librdf_model | Model | Set of Statements usually held in one Storage. |
| Node | librdf_node | Node | The subject, predicate or object of a Statement |
| Storage | librdf_storage | Storage | Storage for Models either persistent or in-memory. |
| Parser | librdf_parser | Parser | Syntax parsers delivering Stream of Statements or writing to a Model |
| Query | librdf_query | Query | Querying of an Model delivering a QueryResults |
| QueryResults | librdf_query_results | QueryResults | Results of applying an Query to a Model giving either variable bindings with Node values or Stream of Statements |
| Serializer | librdf_serializer | Serializer | Serializes a Model into a syntax such as RDF/XML |
| World | librdf_world | World | RDF wrapper class handling Redland startup/shutdown |
Note
In order to communicate with the Redland RDF C libraries, the redland R package uses an interface layer that is created with the software package Simplified Wrapper and Interface Generator (SWIG). The relationship between the redland R package and the Redland C libraries is:
User script -> redland R package -> SWIG R interface -> Redland C libraries -> RDF data
It is recommended that the redland package R classes be used to interact with RDF, as these higher level classes take care of many of the the
details of communicating with the Redland C libraries. However, all of the lower level R interface functions generated by SWIG are made available
by the redland package. These interface functions usually have names beginning with 'librdf_', 'rasqal_' or 'raptor_' and
are usually the same name as the underlying C library function. Documentation
for the R SWIG interface functions can be found via R help i.e. '?librdf_iterator'.
Author(s)
Matthew B. Jones (NCEAS) and Peter Slaughter (NCEAS)
Examples
# This example creates the necessary R objects to hold an RDF model and reads
# in a file that contains RDF/XML statements. This model is then queried for
# and the query results inspected.
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
filePath <- system.file("extdata/example.rdf", package="redland")
parser <- new("Parser", world)
parseFileIntoModel(parser, world, filePath, model)
queryString <- paste("PREFIX dc: <http://purl.org/dc/elements/1.1/> ",
"SELECT ?a ?c WHERE { ?a dc:description ?c . }", sep="")
query <- new("Query", world, queryString, base_uri=NULL,
query_language="sparql", query_uri=NULL)
results <- getResults(query, model, "rdfxml")
# When the query object is no longer needed, the resources it had allocated can be freed.
freeQuery(query)
rm(query)
Roxygen output function that merges a base NAMESPACE file with the Roxygen dynamically created NAMSPACE file
Description
The 'roclet_output' function handles output of the results from the 'roc_process' function. This function merges the NAMESPACE file created by the 'namespace' roclet with the list of Redland RDF functions determined by the 'roc_process' function.
Usage
## S3 method for class 'roclet_mergeNamespace'
roclet_output(x, results, base_path, ...)
Arguments
x |
the currently running roclet |
results |
the list of items to process that was generated by the roc_process.mergedNamespace function |
base_path |
the base directory path of the package |
... |
additional parameters |
Roxygen process function for the 'mergeNamespace' roclet
Description
This function is called by the Roxygen2 roxygenize function.
Usage
## S3 method for class 'roclet_mergeNamespace'
roclet_process(x, blocks, env, base_path)
Arguments
x |
the currently running roclet |
blocks |
the documentation blocks |
env |
the current env |
base_path |
the top directory of the R package |
Details
This function loads the Redland interface file and tests each loaded function to see if it should be exported via the NAMESPACE file.
Serialize a model to a character vector.
Description
Serialize a model to a character vector.
Usage
serializeToCharacter(.Object, world, model, ...)
## S4 method for signature 'Serializer,World,Model'
serializeToCharacter(.Object, world, model, baseUri = as.character(NA))
Arguments
.Object |
a Serializer object |
world |
a World object |
model |
a Model object |
... |
Additional parameters |
baseUri |
a URI to prepend to relative URIs in the document |
Value
a character vector containing the serialized model
Serialize a model to a file.
Description
Serialize a model to a file.
Usage
serializeToFile(.Object, world, model, filePath, ...)
## S4 method for signature 'Serializer,World,Model,character'
serializeToFile(.Object, world, model, filePath, baseUri = as.character(NA))
Arguments
.Object |
a Serializer object |
world |
a World object |
model |
a Model object |
filePath |
a file path that the serialized model will be written to |
... |
Additional parameters |
baseUri |
a base URI to use for the serialization |
Value
an integer containing the return status where non zero indicates an error occurred during serialization
Set a namespace for the serializer.
Description
Set a namespace for the serializer.
Usage
setNameSpace(.Object, world, namespace, prefix)
## S4 method for signature 'Serializer,World,character,character'
setNameSpace(.Object, world, namespace, prefix)
Arguments
.Object |
a Serializer object |
world |
a World object |
namespace |
the namespace to add to the serializer |
prefix |
the namespace prefix to associate with the namespace |
Set limit on returned query results
Description
Set limit on returned query results
Usage
setQueryResultLimit(.Object, limit)
## S4 method for signature 'Query'
setQueryResultLimit(.Object, limit)
Arguments
.Object |
a Query object |
limit |
the result set limit. Specify a value >= to have a limit, or a value < 0 to have no limit. |
Write query results to a file.
Description
Write query results to a file.
Usage
writeResults(.Object, model, ...)
## S4 method for signature 'Query'
writeResults(
.Object,
model,
file,
mimeType = "application/x-turtle",
format_uri = NULL,
base_uri = NULL
)
Arguments
.Object |
a Query object |
model |
a Model object |
... |
additional parameters |
file |
a string specifying the output file |
mimeType |
a string specifying the mimeType of the output file. Currently supported values are "application/x-turtle", "text/plain", "application/json", "text/html" |
format_uri |
(not currently used) |
base_uri |
(not currently used) |
Details
After this method is called, the Query object is no longer usable and should
be deleted "rm(query)" and a new object created.
Examples
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
stmt <- new("Statement", world=world,
subject="https://orcid.org/0000-0002-2192-403X",
predicate="http://www.w3.org/ns/prov#Agent",
object="slaughter",
objectType="literal", datatype_uri="http://www.w3.org/2001/XMLSchema#string")
status <- addStatement(model, stmt)
queryString <- paste("PREFIX orcid: <https://orcid.org/>",
"PREFIX dataone: <https://cn.dataone.org/cn/v1/resolve/>",
"PREFIX prov: <http://www.w3.org/ns/prov#>",
"SELECT ?a ?c WHERE { ?a prov:Agent ?c . }", sep=" ")
query <- new("Query", world, queryString, base_uri=NULL, query_language="sparql", query_uri=NULL)
# Return all results as a string
tf <- tempfile()
writeResults(query, model, file=tf, mimeType="application/x-turtle")
# When the query object is no longer needed, the resources it had allocated can be freed.
freeQuery(query)
rm(query)