Attean::Expression(3) 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:

  • Attean::ValueExpression
  • Attean::UnaryExpression
  • Attean::BinaryExpression
  • Attean::FunctionExpression


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


Gregory Todd Williams "<[email protected]>"


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.