1RDF::Trine::Node::FormuUlsae(r3)Contributed Perl DocumenRtDaFt:i:oTnrine::Node::Formula(3)
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NAME

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

10       Formulae are implemented as a subclass of literals. Parts of Trine that
11       have no special knowledge about formulae (e.g. the Turtle serialiser)
12       will just see them as literals with a particular datatype URI
13       (http://open.vocab.org/terms/Formula).
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15       If your code needs to detect formulae nodes, try:
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17         use Scalar::Util qw[blessed];
18         if (blessed($node) && $node->isa('RDF::Trine::Node::Formula'))
19           { ... do stuff to formulae ... }
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21       or perhaps
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23         use Scalar::Util qw[blessed];
24         if (blessed($node) && $node->can('pattern'))
25           { ... do stuff to formulae ... }
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Constructor

28       "new ( $pattern )"
29           Returns a new Formula structure. This is a subclass of
30           RDF::Trine::Node::Literal.
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32           $pattern is an RDF::Trine::Pattern or a string capable of being
33           parsed with RDF::Trine::Parser::Notation3->parse_formula.
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Methods

36       "pattern ( $node )"
37           Returns the formula as an RDF::Trine::Pattern.
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39       "forAll"
40           Returns the a list of nodes with the @forAll quantifier.
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42           This is a fairly obscure bit of N3 semantics.
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44       "forSome"
45           Returns the a list of nodes with the @forSome quantifier.
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47           This is a fairly obscure bit of N3 semantics.
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49       "as_literal_notation"
50           Returns the formula in Notation-3-like syntax, excluding the
51           wrapping "{"..."}".
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53           Uses absolute URIs whenever possible, avoiding relative URI
54           references, QNames and keywords.
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56       "from_literal_notation ( $string, $base )"
57           Modifies the formula's value using Notation 3 syntax, excluding the
58           wrapping "{"..."}".
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60       "equal ( $node )"
61           Returns true if the two nodes are equal, false otherwise.
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63           TODO - really need a "not equal, but equivalent" method.
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BUGS

66       Please report any bugs to
67       <http://rt.cpan.org/Dist/Display.html?Queue=RDF-TriN3>.
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SEE ALSO

70       RDF::Trine::Node, RDF::Trine::Pattern.
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AUTHOR

73       Toby Inkster  "<tobyink@cpan.org>"
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75       Based on RDF::Trine::Node::Literal by Gregory Todd Williams.
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78       Copyright (c) 2006-2010 Gregory Todd Williams.
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80       Copyright (c) 2010-2012 Toby Inkster.
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82       This library is free software; you can redistribute it and/or modify it
83       under the same terms as Perl itself.
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DISCLAIMER OF WARRANTIES

86       THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
87       WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
88       MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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92perl v5.28.0                      2013-09-18      RDF::Trine::Node::Formula(3)
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