NAME

RDF::Query::Algebra::Quad - Algebra class for Quad patterns

VERSION

This document describes RDF::Query::Algebra::Quad version 2.200, released 6 August 2009.

METHODS

as_sparql

Returns the SPARQL string for this alegbra expression.

referenced_blanks

Returns a list of the blank node names used in this algebra expression.

qualify_uris ( \%namespaces, $base )

Returns a new algebra pattern where all referenced Resource nodes representing QNames (ns:local) are qualified using the supplied %namespaces.

bf ()

Returns a string representing the state of the nodes of the triple (bound or free).

distinguish_bnode_variables

Returns a new Quad object with blank nodes replaced by distinguished variables.

fixup ( $query, $bridge, $base, \%namespaces )

Returns a new pattern that is ready for execution using the given bridge. This method replaces generic node objects with bridge-native objects.

label ( $label => $value )

Sets the named $label to $value for this quad object. If no $value is given, returns the current label value, or undef if none exists.

AUTHOR

 Gregory Todd Williams <gwilliams@cpan.org>