redland (version 1.0.17-6)

Statement-class: An RDF Statement object

Description

A Statement object is created using the provided subject, predicate and 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.}

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.

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")