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.\"
.IX Title "RDF::Trine::VariableBindings 3pm"
.TH RDF::Trine::VariableBindings 3pm "2018-11-03" "perl v5.28.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
RDF::Trine::VariableBindings \- Variable bindings
.SH "VERSION"
.IX Header "VERSION"
This document describes RDF::Trine::VariableBindings version 1.019
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 6
\&  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"
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
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.
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP """new ( \e%bindings )""" 4
.el .IP "\f(CWnew ( \e%bindings )\fR" 4
.IX Item "new ( %bindings )"
.PD 0
.ie n .IP """set ( $variable_name => $node )""" 4
.el .IP "\f(CWset ( $variable_name => $node )\fR" 4
.IX Item "set ( $variable_name => $node )"
.ie n .IP """join ( $row )""" 4
.el .IP "\f(CWjoin ( $row )\fR" 4
.IX Item "join ( $row )"
.PD
Returns a new VariableBindings object based on the join of this object and \f(CW$row\fR.
If the two variable binding objects cannot be joined, returns undef.
.ie n .IP """variables""" 4
.el .IP "\f(CWvariables\fR" 4
.IX Item "variables"
.PD 0
.ie n .IP """project ( @keys )""" 4
.el .IP "\f(CWproject ( @keys )\fR" 4
.IX Item "project ( @keys )"
.PD
Returns a new binding with values for only the keys listed.
.ie n .IP """as_string""" 4
.el .IP "\f(CWas_string\fR" 4
.IX Item "as_string"
Returns a string representation of the variable bindings.
.ie n .IP """label ( $label => $value )""" 4
.el .IP "\f(CWlabel ( $label => $value )\fR" 4
.IX Item "label ( $label => $value )"
Sets the named \f(CW$label\fR to \f(CW$value\fR for this variable bindings object.
If no \f(CW$value\fR is given, returns the current label value, or undef if none
exists.
.ie n .IP """copy_labels_from ( $vb )""" 4
.el .IP "\f(CWcopy_labels_from ( $vb )\fR" 4
.IX Item "copy_labels_from ( $vb )"
Copies the labels from \f(CW$vb\fR, adding them to the labels for this object.
.SH "BUGS"
.IX Header "BUGS"
Please report any bugs or feature requests to through the GitHub web interface
at <https://github.com/kasei/perlrdf/issues>.
.SH "AUTHOR"
.IX Header "AUTHOR"
.Vb 1
\& Gregory Todd Williams <gwilliams@cpan.org>
.Ve
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
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.