plucky (3) RDF::Query::Algebra.3pm.gz

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>