NAME

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

VERSION

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

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

"new ( $pattern, $opt_pattern )": Returns a new Optional structure.
"construct_args": Returns a list of arguments that, passed to this class' constructor, will produce a clone of this algebra pattern.
"pattern": Returns the base pattern (LHS) onto which the optional pattern joins.
"optional": Returns the optional pattern (RHS).
"sse": Returns the SSE string for this algebra expression.
"as_sparql": Returns the SPARQL string for this algebra expression.
"as_spin ( $model )": Adds statements to the given model to represent this algebra object in the SPARQL Inferencing Notation (<http://www.spinrdf.org/>).
"as_hash": Returns the query as a nested set of plain data structures (no objects).
"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.

 Gregory Todd Williams <gwilliams@cpan.org>