NAME¶

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

VERSION¶

This document describes RDF::Trine::Node::Literal version 1.019

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.