NAME

RDF::Trine::Node::Literal - RDF Node class for literals

VERSION

This document describes RDF::Trine::Node::Literal version 1.017

METHODS

Beyond the methods documented below, this class inherits methods from the RDF::Trine::Node class.

new ( $string, $lang, $datatype, $canonical_flag )

Returns a new Literal structure.

literal_value

Returns the string value of the literal.

literal_value_language

Returns the language tag of the ltieral.

literal_datatype

Returns the datatype of the literal.

value

Returns the literal value.

sse

Returns the SSE string for this literal.

as_string

Returns a string representation of the node.

as_ntriples

Returns the node in a string form suitable for NTriples serialization.

type

Returns the type string of this node.

has_language

Returns true if this literal is language-tagged, false otherwise.

has_datatype

Returns true if this literal is datatyped, false otherwise.

equal ( $node )

Returns true if the two nodes are equal, false otherwise.

canonicalize

Returns a new literal node object whose value is in canonical form (where applicable).

canonicalize_literal_value ( $string, $datatype, $warn )

If $datatype is a recognized datatype, returns the canonical lexical representation of the value $string. Otherwise returns $string.

Currently, xsd:integer, xsd:decimal, and xsd:boolean are canonicalized. Additionally, invalid lexical forms for xsd:float, xsd:double, and xsd:dateTime will trigger a warning.

is_canonical_lexical_form

is_valid_lexical_form

Returns true if the node is of a recognized datatype and has a valid lexical form for that datatype. If the lexical form is invalid, returns false. If the datatype is unrecognized, returns zero-but-true.

is_numeric_type

Returns true if the literal is a known (xsd) numeric type.

numeric_value

Returns the numeric value of the literal (even if the literal isn't a known numeric type.

BUGS

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

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>

COPYRIGHT

Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.