NAME

       Attean::Expression - SPARQL Expressions

VERSION

       This document describes Attean::Expression version 0.012

SYNOPSIS

         use v5.14;
         use Attean;

         my $binding = Attean::Result->new();
         my $value = Attean::ValueExpression->new( value => Attean::Literal->integer(2) );
         my $plus = Attean::BinaryExpression->new( children => [$value, $value], operator => '+' );
         my $result = $plus->evaluate($binding);
         say $result->numeric_value; # 4

DESCRIPTION

       This is a utility package that defines all the Attean SPARQL expression classes consisting
       of logical, numeric, and function operators, constant terms, and variables. Expressions
       may be evaluated in the context of a Attean::API::Result object, and either return a
       Attean::API::Term object or throw a type error exception.

       The expression classes are:

       •   Attean::ValueExpression

       •   Attean::UnaryExpression

       •   Attean::BinaryExpression

       •   Attean::FunctionExpression

BUGS

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

SEE ALSO

       <http://www.perlrdf.org/>

AUTHOR

       Gregory Todd Williams  "<gwilliams@cpan.org>"

COPYRIGHT

       Copyright (c) 2014--2016 Gregory Todd Williams.  This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl itself.