1RDF::Trine::VariableBinUdsienrgsC(o3n)tributed Perl DocuRmDeFn:t:aTtriionne::VariableBindings(3)
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NAME

6       RDF::Trine::VariableBindings - Variable bindings
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VERSION

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

12         use RDF::Trine qw(literal);
13         use RDF::Trine::VariableBindings;
14         my $vb = RDF::Trine::VariableBindings->new( {} );
15         $vb->set( foo => literal("bar") );
16         $vb->set( baz => literal("blee") );
17         $vb->variables; # qw(foo baz)
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19         my $x = RDF::Trine::VariableBindings->new( { foo => literal("bar") } );
20         $x->set( greeting => literal("hello") );
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22         my $j = $vb->join( $x ); # { foo => "bar", baz => "blee", greeting => "hello" }
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24         my @keys = qw(baz greeting);
25         my $p = $j->project( @keys ); # { baz => "blee", greeting => "hello" }
26         print $p->{greeting}->literal_value; # "hello"
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DESCRIPTION

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

34       "new ( \%bindings )"
35       "set ( $variable_name => $node )"
36       "join ( $row )"
37           Returns a new VariableBindings object based on the join of this
38           object and $row.  If the two variable binding objects cannot be
39           joined, returns undef.
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41       "variables"
42       "project ( @keys )"
43           Returns a new binding with values for only the keys listed.
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45       "as_string"
46           Returns a string representation of the variable bindings.
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48       "label ( $label => $value )"
49           Sets the named $label to $value for this variable bindings object.
50           If no $value is given, returns the current label value, or undef if
51           none exists.
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53       "copy_labels_from ( $vb )"
54           Copies the labels from $vb, adding them to the labels for this
55           object.
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BUGS

58       Please report any bugs or feature requests to through the GitHub web
59       interface at <https://github.com/kasei/perlrdf/issues>.
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AUTHOR

62        Gregory Todd Williams <gwilliams@cpan.org>
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65       Copyright (c) 2006-2012 Gregory Todd Williams. This program is free
66       software; you can redistribute it and/or modify it under the same terms
67       as Perl itself.
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71perl v5.30.0                      2019-07-26   RDF::Trine::VariableBindings(3)
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