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Attean::API::Expression - SPARQL expressions

Attean::API::Expression(3pm) User Contributed Perl Documentation Attean::API::Expression(3pm)

NAME

Attean::API::Expression - SPARQL expressions

VERSION

This document describes Attean::API::Expression version 0.017

DESCRIPTION

The Attean::API::Expression role defines a common API for SPARQL expressions 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.

ROLES

This role consumes the Attean::API::DirectedAcyclicGraph role which provide the following methods:
"is_leaf"
"walk( prefix => \&pre_cb, postfix => \&pre_cb )"
"cover( prefix => \&pre_cb, postfix => \&pre_cb )"
and the following attributes:
"children"

ATTRIBUTES

The following attributes exist:
"operator"
A string indicating the expression operator (e.g. '+' or '||').

REQUIRED METHODS

The following methods are required by the Attean::API::Expression role:
"as_string"
Returns a string serialization of the expression object.

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 (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.
2017-10-02 perl v5.26.0