NAME

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

VERSION

This document describes RDF::Query::Algebra::NamedGraph version 2.918.

METHODS

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

new ( $graph, $pattern )

Returns a new NamedGraph structure.

construct_args

Returns a list of arguments that, passed to this class' constructor, will produce a clone of this algebra pattern.

graph

Returns the graph node of the named graph expression.

pattern

Returns the graph pattern of the named graph expression.

quads

Returns a list of the quads belonging to this NamedGraph.

sse

Returns the SSE string for this algebra expression.

explain

Returns a string serialization of the algebra appropriate for display on the command line.

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).

as_spin ( $model )

Adds statements to the given model to represent this algebra object in the SPARQL Inferencing Notation (http://www.spinrdf.org/).

type

Returns the type of this algebra expression.

referenced_variables

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

potentially_bound

Returns a list of the variable names used in this algebra expression that will bind values during execution.

definite_variables

Returns a list of the variable names that will be bound after evaluating 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.

check_duplicate_blanks

Returns true if blank nodes respect the SPARQL rule of no blank-label re-use across BGPs, otherwise throws a RDF::Query::Error::QueryPatternError exception.

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>