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.IX Title "RDF::Query::Node 3pm"
.TH RDF::Query::Node 3pm 2024-04-12 "perl v5.38.2" "User Contributed Perl Documentation"
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.nh
.SH NAME
RDF::Query::Node \- Base class for RDF Nodes
.SH VERSION
.IX Header "VERSION"
This document describes RDF::Query::Node version 2.918.
.SH METHODS
.IX Header "METHODS"
.ie n .IP """is_variable""" 4
.el .IP \f(CWis_variable\fR 4
.IX Item "is_variable"
Returns true if this RDF node is a variable, false otherwise.
.ie n .IP """compare ( $a, $b )""" 4
.el .IP "\f(CWcompare ( $a, $b )\fR" 4
.IX Item "compare ( $a, $b )"
Returns \-1, 0, or 1 if \f(CW$a\fR is less than, equal to, or greater than \f(CW$b\fR, respectively,
according to the SPARQL sorting rules.
.ie n .IP """from_trine ( $node )""" 4
.el .IP "\f(CWfrom_trine ( $node )\fR" 4
.IX Item "from_trine ( $node )"
Returns a new RDF::Query::Node object with the same value as \f(CW$node\fR, a
RDF::Trine::Node object. This essentially promotes \f(CW$node\fR to a
node object with extra functionality provided by the RDF::Query package
(like SPARQL-defined ordering).
.ie n .IP """from_attean ( $node )""" 4
.el .IP "\f(CWfrom_attean ( $node )\fR" 4
.IX Item "from_attean ( $node )"
Likewise, but from Attean.
.ie n .IP """explain""" 4
.el .IP \f(CWexplain\fR 4
.IX Item "explain"
Returns a string serialization of the node appropriate for display on the
command line. This method is primarily used by the \f(CW\*(C`explain\*(C'\fR method of
the subclasses of RDF::Query::Plan.
.SH FUNCTIONS
.IX Header "FUNCTIONS"
.ie n .IP """compare ( $node_a, $node_b )""" 4
.el .IP "\f(CWcompare ( $node_a, $node_b )\fR" 4
.IX Item "compare ( $node_a, $node_b )"
Returns \-1, 0, or 1 if \f(CW$node_a\fR sorts less than, equal to, or greater than
\&\f(CW$node_b\fR in the defined SPARQL ordering, respectively. This function may be
used as the function argument to \f(CW\*(C`<sort\*(C'\fR>.
.ie n .IP """iri ( $iri )""" 4
.el .IP "\f(CWiri ( $iri )\fR" 4
.IX Item "iri ( $iri )"
Returns a RDF::Query::Node::Resource object with the given IRI value.
.ie n .IP """blank ( $id )""" 4
.el .IP "\f(CWblank ( $id )\fR" 4
.IX Item "blank ( $id )"
Returns a RDF::Query::Node::Blank object with the given identifier.
.ie n .IP """literal ( $value, $lang, $dt )""" 4
.el .IP "\f(CWliteral ( $value, $lang, $dt )\fR" 4
.IX Item "literal ( $value, $lang, $dt )"
Returns a RDF::Query::Node::Literal object with the given value and optional
language/datatype.
.ie n .IP """variable ( $name )""" 4
.el .IP "\f(CWvariable ( $name )\fR" 4
.IX Item "variable ( $name )"
Returns a RDF::Query::Node::Variable object with the given variable name.
.SH AUTHOR
.IX Header "AUTHOR"
.Vb 1
\& Gregory Todd Williams <gwilliams@cpan.org>
.Ve