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.IX Title "RDF::Query::Algebra 3pm"
.TH RDF::Query::Algebra 3pm 2024-04-12 "perl v5.38.2" "User Contributed Perl Documentation"
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.SH NAME
RDF::Query::Algebra \- Base class for Algebra expressions
.SH VERSION
.IX Header "VERSION"
This document describes RDF::Query::Algebra version 2.918.
.SH METHODS
.IX Header "METHODS"
.ie n .IP """potentially_bound""" 4
.el .IP \f(CWpotentially_bound\fR 4
.IX Item "potentially_bound"
Returns a list of the variable names used in this algebra expression that will
bind values during execution.
.ie n .IP """referenced_blanks""" 4
.el .IP \f(CWreferenced_blanks\fR 4
.IX Item "referenced_blanks"
Returns a list of the blank node names used in this algebra expression.
.ie n .IP """referenced_functions""" 4
.el .IP \f(CWreferenced_functions\fR 4
.IX Item "referenced_functions"
Returns a list of the Function URIs used in this algebra expression.
.ie n .IP """check_duplicate_blanks""" 4
.el .IP \f(CWcheck_duplicate_blanks\fR 4
.IX Item "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.
.ie n .IP """qualify_uris ( \e%namespaces, $base_uri )""" 4
.el .IP "\f(CWqualify_uris ( \e%namespaces, $base_uri )\fR" 4
.IX Item "qualify_uris ( %namespaces, $base_uri )"
Returns a new algebra pattern where all referenced Resource nodes representing
QNames (ns:local) are qualified using the supplied \f(CW%namespaces\fR.
.ie n .IP """bind_variables ( \e%bound )""" 4
.el .IP "\f(CWbind_variables ( \e%bound )\fR" 4
.IX Item "bind_variables ( %bound )"
Returns a new algebra pattern with variables named in \f(CW%bound\fR replaced by their corresponding bound values.
.ie n .IP """is_solution_modifier""" 4
.el .IP \f(CWis_solution_modifier\fR 4
.IX Item "is_solution_modifier"
Returns true if this node is a solution modifier.
.ie n .IP """subpatterns_of_type ( $type [, $block] )""" 4
.el .IP "\f(CWsubpatterns_of_type ( $type [, $block] )\fR" 4
.IX Item "subpatterns_of_type ( $type [, $block] )"
Returns a list of Algebra patterns matching \f(CW$type\fR (tested with \f(CW\*(C`isa\*(C'\fR).
If \f(CW$block\fR is given, then matching stops descending a subtree if the current
node is of type \f(CW$block\fR, continuing matching on other subtrees.
This list includes the current algebra object if it matches \f(CW$type\fR, and is
generated in infix order.
.ie n .IP """from_sse ( $sse, \e%context )""" 4
.el .IP "\f(CWfrom_sse ( $sse, \e%context )\fR" 4
.IX Item "from_sse ( $sse, %context )"
Given an SSE serialization, returns the corresponding algebra expression.
.SH FUNCTIONS
.IX Header "FUNCTIONS"
.ie n .IP """triple ( $subj, $pred, $obj )""" 4
.el .IP "\f(CWtriple ( $subj, $pred, $obj )\fR" 4
.IX Item "triple ( $subj, $pred, $obj )"
Returns a RDF::Query::Algebra::Triple object with the supplied node objects.
.ie n .IP """bgp ( @triples )""" 4
.el .IP "\f(CWbgp ( @triples )\fR" 4
.IX Item "bgp ( @triples )"
Returns a RDF::Query::Algebra::BasicGraphPattern object with the supplied triples.
.ie n .IP """ggp ( @patterns )""" 4
.el .IP "\f(CWggp ( @patterns )\fR" 4
.IX Item "ggp ( @patterns )"
Returns a RDF::Query::Algebra::GroupGraphPattern object with the supplied algebra patterns.
.SH AUTHOR
.IX Header "AUTHOR"
.Vb 1
\& Gregory Todd Williams <gwilliams@cpan.org>
.Ve