RDF::Query::Algebra(3)

NAME
RDF::Query::Algebra - Base class for Algebra expressions

VERSION
This document describes RDF::Query::Algebra version 2.919.

METHODS

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

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

"referenced_functions"
    Returns a list of the Function URIs used in 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.

"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.

"bind_variables ( \%bound )"
    Returns a new algebra pattern with variables named in %bound replaced by their corresponding bound values.

"is_solution_modifier"
    Returns true if this node is a solution modifier.

"subpatterns_of_type ( $type [, $block] )"
    Returns a list of Algebra patterns matching $type (tested with "isa"). If $block is given, then matching stops descending a subtree if the current node is of type $block, continuing matching on other subtrees. This list includes the current algebra object if it matches $type, and is generated in infix order.

"from_sse ( $sse, \%context )"
    Given an SSE serialization, returns the corresponding algebra expression.

FUNCTIONS

"triple ( $subj, $pred, $obj )"
    Returns a RDF::Query::Algebra::Triple object with the supplied node objects.

"bgp ( @triples )"
    Returns a RDF::Query::Algebra::BasicGraphPattern object with the supplied triples.

"ggp ( @patterns )"
    Returns a RDF::Query::Algebra::GroupGraphPattern object with the supplied algebra patterns.

AUTHOR
 Gregory Todd Williams <gwilliams@cpan.org>