NAME¶

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

VERSION¶

This document describes RDF::Query::Node version 2.919.

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).

"from_attean ( $node )"

Likewise, but from Attean.

"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>