---
name: "RDF::Trine::Node::Literal"
section: "3pm"
platform: "linux"
package: "librdf-trine-perl"
version: "1.019-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/RDF::Trine::Node::Literal"
---

# RDF::Trine::Node::Literal(3pm)

RDF Node class for literals

## 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.