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.\" ========================================================================
.\"
.IX Title "RDF::Trine::Node::Formula 3pm"
.TH RDF::Trine::Node::Formula 3pm "2021-01-05" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
RDF::Trine::Node::Formula \- RDF Node class for formulae / graph literals
.SH "DESCRIPTION"
.IX Header "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 \s-1URI\s0 (http://open.vocab.org/terms/Formula).
.PP
If your code needs to detect formulae nodes, try:
.PP
.Vb 3
\&  use Scalar::Util qw[blessed];
\&  if (blessed($node) && $node\->isa(\*(AqRDF::Trine::Node::Formula\*(Aq))
\&    { ... do stuff to formulae ... }
.Ve
.PP
or perhaps
.PP
.Vb 3
\&  use Scalar::Util qw[blessed];
\&  if (blessed($node) && $node\->can(\*(Aqpattern\*(Aq))
\&    { ... do stuff to formulae ... }
.Ve
.SH "Constructor"
.IX Header "Constructor"
.ie n .IP """new ( $pattern )""" 4
.el .IP "\f(CWnew ( $pattern )\fR" 4
.IX Item "new ( $pattern )"
Returns a new Formula structure. This is a subclass of RDF::Trine::Node::Literal.
.Sp
\&\f(CW$pattern\fR is an RDF::Trine::Pattern or a string capable of being parsed with
RDF::Trine::Parser::Notation3\->parse_formula.
.SH "Methods"
.IX Header "Methods"
.ie n .IP """pattern ( $node )""" 4
.el .IP "\f(CWpattern ( $node )\fR" 4
.IX Item "pattern ( $node )"
Returns the formula as an RDF::Trine::Pattern.
.ie n .IP """forAll""" 4
.el .IP "\f(CWforAll\fR" 4
.IX Item "forAll"
Returns the a list of nodes with the \f(CW@forAll\fR quantifier.
.Sp
This is a fairly obscure bit of N3 semantics.
.ie n .IP """forSome""" 4
.el .IP "\f(CWforSome\fR" 4
.IX Item "forSome"
Returns the a list of nodes with the \f(CW@forSome\fR quantifier.
.Sp
This is a fairly obscure bit of N3 semantics.
.ie n .IP """as_literal_notation""" 4
.el .IP "\f(CWas_literal_notation\fR" 4
.IX Item "as_literal_notation"
Returns the formula in Notation\-3\-like syntax, excluding the wrapping \*(L"{\*(R"...\*(L"}\*(R".
.Sp
Uses absolute URIs whenever possible, avoiding relative \s-1URI\s0 references,
QNames and keywords.
.ie n .IP """from_literal_notation ( $string, $base )""" 4
.el .IP "\f(CWfrom_literal_notation ( $string, $base )\fR" 4
.IX Item "from_literal_notation ( $string, $base )"
Modifies the formula's value using Notation 3 syntax, excluding the wrapping \*(L"{\*(R"...\*(L"}\*(R".
.ie n .IP """equal ( $node )""" 4
.el .IP "\f(CWequal ( $node )\fR" 4
.IX Item "equal ( $node )"
Returns true if the two nodes are equal, false otherwise.
.Sp
\&\s-1TODO\s0 \- really need a \*(L"not equal, but equivalent\*(R" method.
.SH "BUGS"
.IX Header "BUGS"
Please report any bugs to
<http://rt.cpan.org/Dist/Display.html?Queue=RDF\-TriN3>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
RDF::Trine::Node,
RDF::Trine::Pattern.
.SH "AUTHOR"
.IX Header "AUTHOR"
Toby Inkster  \f(CW\*(C`<tobyink@cpan.org>\*(C'\fR
.PP
Based on RDF::Trine::Node::Literal by Gregory Todd Williams.
.SH "COPYRIGHT AND LICENCE"
.IX Header "COPYRIGHT AND LICENCE"
Copyright (c) 2006\-2010 Gregory Todd Williams.
.PP
Copyright (c) 2010\-2012 Toby Inkster.
.PP
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.SH "DISCLAIMER OF WARRANTIES"
.IX Header "DISCLAIMER OF WARRANTIES"
\&\s-1THIS PACKAGE IS PROVIDED \*(L"AS IS\*(R" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.\s0