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

This document describes RDF::Query::Algebra::Quad version 2.907.

Beyond the methods documented below, this class inherits methods from the RDF::Query::Algebra class.

new ( $s, $p, $o, $g )

Returns a new Quad structure.

as_sparql

Returns the SPARQL string for this algebra expression.

as_hash

Returns the query as a nested set of plain data structures (no objects).

referenced_blanks

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

qualify_uris ( \%namespaces, $base_uri )

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.

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.

 Gregory Todd Williams <gwilliams@cpan.org>