NAME

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

VERSION

This document describes RDF::Query::Algebra::BasicGraphPattern version 2.902_01.

METHODS

new ( @triples )

Returns a new BasicGraphPattern structure.

construct_args

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

triples

Returns a list of triples belonging to this BGP.

sse

Returns the SSE string for this alegbra expression.

as_sparql

Returns the SPARQL string for this alegbra expression.

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.

binding_variables

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.

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.

connected

Returns true if the pattern is connected through shared variables, fase otherwise.

subsumes ( $pattern )

Returns true if the bgp subsumes the pattern, false otherwise.

bf ()

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

clone

bind_variables ( \%bound )

Returns a new algebra pattern with variables named in %bound replaced by their corresponding bound values.

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>