Attean::Expression − SPARQL Expressions
This document describes Attean::Expression version 0.017
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
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:
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Attean::ValueExpression |
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Attean::UnaryExpression |
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Attean::BinaryExpression |
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Attean::FunctionExpression |
Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/attean/issues>.
<http://www.perlrdf.org/>
Gregory Todd Williams "<gwilliams AT cpan DOT org>"
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.