RDF::TRINE::VARIABLEBINDINGS(3PM) - Linux man page online | Library functions

Variable bindings.

RDF::Trine::VariableBindings(3pUser Contributed Perl DocumentatiRDF::Trine::VariableBindings(3pm)


RDF::Trine::VariableBindings - Variable bindings


This document describes RDF::Trine::VariableBindings version 1.019


use RDF::Trine qw(literal); use RDF::Trine::VariableBindings; my $vb = RDF::Trine::VariableBindings->new( {} ); $vb->set( foo => literal("bar") ); $vb->set( baz => literal("blee") ); $vb->variables; # qw(foo baz) my $x = RDF::Trine::VariableBindings->new( { foo => literal("bar") } ); $x->set( greeting => literal("hello") ); my $j = $vb->join( $x ); # { foo => "bar", baz => "blee", greeting => "hello" } my @keys = qw(baz greeting); my $p = $j->project( @keys ); # { baz => "blee", greeting => "hello" } print $p->{greeting}->literal_value; # "hello"


RDF::Trine::VariableBindings objects provide a mapping from variable names to RDF::Trine::Node objects. The objects may be used as a hash reference, with variable names used as hash keys.


"new ( \%bindings )" "set ( $variable_name => $node )" "join ( $row )" Returns a new VariableBindings object based on the join of this object and $row. If the two variable binding objects cannot be joined, returns undef. "variables" "project ( @keys )" Returns a new binding with values for only the keys listed. "as_string" Returns a string representation of the variable bindings. "label ( $label => $value )" Sets the named $label to $value for this variable bindings object. If no $value is given, returns the current label value, or undef if none exists. "copy_labels_from ( $vb )" Copies the labels from $vb, adding them to the labels for this object.


Please report any bugs or feature requests to through the GitHub web interface at <>.


Gregory Todd Williams <>
Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.26.1 2018-01-05 RDF::Trine::VariableBindings(3pm)
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