Gregory Todd Williams > RDF-Query-2.908 > RDF::Query::Node

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Module Version: 2.908   Source   Latest Release: RDF-Query-2.910

NAME ^

RDF::Query::Node - Base class for RDF Nodes

VERSION ^

This document describes RDF::Query::Node version 2.908.

METHODS ^

is_variable

Returns true if this RDF node is a variable, false otherwise.

compare ( $a, $b )

Returns -1, 0, or 1 if $a is less than, equal to, or greater than $b, respectively, according to the SPARQL sorting rules.

from_trine ( $node )

Returns a new RDF::Query::Node object with the same value as $node, a RDF::Trine::Node object. This essentially promotes $node to a node object with extra functionality provided by the RDF::Query package (like SPARQL-defined ordering).

explain

Returns a string serialization of the node appropriate for display on the command line. This method is primarily used by the explain method of the subclasses of RDF::Query::Plan.

FUNCTIONS ^

compare ( $node_a, $node_b )

Returns -1, 0, or 1 if $node_a sorts less than, equal to, or greater than $node_b in the defined SPARQL ordering, respectively. This function may be used as the function argument to <sort>.

iri ( $iri )

Returns a RDF::Query::Node::Resource object with the given IRI value.

blank ( $id )

Returns a RDF::Query::Node::Blank object with the given identifier.

literal ( $value, $lang, $dt )

Returns a RDF::Query::Node::Literal object with the given value and optional language/datatype.

variable ( $name )

Returns a RDF::Query::Node::Variable object with the given variable name.

AUTHOR ^

 Gregory Todd Williams <gwilliams@cpan.org>
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