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Attean::Expression

NAME

Attean::Expression − SPARQL Expressions

VERSION

This document describes Attean::Expression version 0.017

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 AT cpan DOT 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.

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