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rdf::trine::node::formula(3pm) [debian man page]

RDF::Trine::Node::Formula(3pm)				User Contributed Perl Documentation			    RDF::Trine::Node::Formula(3pm)

NAME

       RDF::Trine::Node::Formula - RDF Node class for formulae / graph literals

DESCRIPTION

       Formulae are implemented as a subclass of literals. Parts of Trine that have no special knowledge about formulae (e.g. the Turtle
       serialiser) will just see them as literals with a particular datatype URI (http://open.vocab.org/terms/Formula).

       If your code needs to detect formulae nodes, try:

	 use Scalar::Util qw[blessed];
	 if (blessed($node) && $node->isa('RDF::Trine::Node::Formula'))
	   { ... do stuff to formulae ... }

       or perhaps

	 use Scalar::Util qw[blessed];
	 if (blessed($node) && $node->can('pattern'))
	   { ... do stuff to formulae ... }

METHODS

       "new ( $pattern )"
	   Returns a new Formula structure. This is a subclass of RDF::Trine::Node::Literal.

	   $pattern is an RDF::Trine::Pattern or a string capable of being parsed with RDF::Trine::Parser::Notation3->parse_formula.

       "pattern ( $node )"
	   Returns the formula as an RDF::Trine::Pattern.

       "forAll"
	   Returns the a list of nodes with the @forAll quantifier.

	   This is a fairly obscure bit of N3 semantics.

       "forSome"
	   Returns the a list of nodes with the @forSome quantifier.

	   This is a fairly obscure bit of N3 semantics.

       "as_literal_notation"
	   Returns the formula in Notation-3-like syntax, excluding the wrapping "{"..."}".

	   Uses absolute URIs whenever possible, avoiding relative URI references, QNames and keywords.

       "from_literal_notation ( $string, $base )"
	   Modifies the formula's value using Notation 3 syntax, excluding the wrapping "{"..."}".

       "equal ( $node )"
	   Returns true if the two nodes are equal, false otherwise.

	   TODO - really need a "not equal, but equivalent" method.

AUTHOR

       Toby Inkster  "<tobyink@cpan.org>"

       Based on RDF::Trine::Node::Literal by Gregory Todd Williams.

COPYRIGHT AND LICENCE

       Copyright (c) 2006-2010 Gregory Todd Williams.

       Copyright (c) 2010-2011 Toby Inkster.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

DISCLAIMER OF WARRANTIES

       THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
       MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.

perl v5.14.2							    2011-10-22					    RDF::Trine::Node::Formula(3pm)

Check Out this Related Man Page

RDF::Trine::Node(3pm)					User Contributed Perl Documentation				     RDF::Trine::Node(3pm)

NAME

       RDF::Trine::Node - Base class for RDF Nodes

VERSION

       This document describes RDF::Trine::Node version 1.000

FUNCTIONS

       "ntriples_escape ( $value )"
	   Returns the passed string value with special characters (control characters, Unicode, etc.) escaped, suitable for printing inside an
	   N-Triples or Turtle encoded literal.

METHODS

       "is_node"
	   Returns true if this object is a RDF node, false otherwise.

       "is_nil"
	   Returns true if this object is the nil-valued node.

       "is_blank"
	   Returns true if this RDF node is a blank node, false otherwise.

       "is_resource"
	   Returns true if this RDF node is a resource, false otherwise.

       "is_literal"
	   Returns true if this RDF node is a literal, false otherwise.

       "is_variable"
	   Returns true if this RDF node is a variable, false otherwise.

       "as_string"
	   Returns the node in a string form.

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

       "sse"
	   Returns the SSE serialization of the node.

       "equal ( $node )"
	   Returns true if the two nodes are equal, false otherwise.

       "compare ( $node_a, $node_b )"
	   Returns -1, 0, or 1 if $node_a sorts less than, equal to, or greater than $node_b in the defined SPARQL ordering, respectively. This
	   function may be used as the function argument to "<sort">.

       "from_sse ( $string, $context )"
	   Parses the supplied SSE-encoded string and returns a RDF::Trine::Node object.

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.

perl v5.14.2							    2012-06-29						     RDF::Trine::Node(3pm)
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