# RDF::QUERY::ALGEBRA(3PM) - man page online | library functions

Base class for Algebra expressions.

Chapter

2015-10-16

RDF::Query::Algebra(3pm) User Contributed Perl Documentation RDF::Query::Algebra(3pm)## NAME

RDF::Query::Algebra - Base class for Algebra expressions## VERSION

This document describes RDF::Query::Algebra version 2.916.## 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 <@cpan.org>perl v5.20.2 2015-10-16 RDF::Query::Algebra(3pm)