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.\"
.IX Title "RDF::Closure::DatatypeHandling 3pm"
.TH RDF::Closure::DatatypeHandling 3pm "2021-09-24" "perl v5.32.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
RDF::Closure::DatatypeHandling \- validate and canonicalise typed literals
.SH "ANALOGOUS PYTHON"
.IX Header "ANALOGOUS PYTHON"
RDFClosure/DatatypeHandling.py
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Provides datatype handling functions for \s-1OWL 2 RL\s0 and \s-1RDFS\s0 datatypes.
.SS "Functional Interface"
.IX Subsection "Functional Interface"
This module can export four functions:
.IP "\(bu" 4
\&\f(CW\*(C`literal_canonical($lit)\*(C'\fR
.Sp
Given an RDF::Trine::Node::Literal, returns a literal with the canonical lexical
value for its given datatype. If the literal is not a valid lexical form for its datatype
throws an Error.
.Sp
If the literal is a plain literal, returns an rdf:PlainLiteral typed literal; if the
literal is of an unrecognised datatype, simply returns the original literal.
.Sp
Note that as per \s-1OWL 2 RL\s0 rules, xsd:dateTime literals are \fInot\fR shifted to \s-1UTC,\s0
even though \s-1XSD\s0 says that \s-1UTC\s0 is the canonical form. By setting the
\&\f(CW\*(C`force_utc\*(C'\fR to true, you can force XSD-style canonicalisation. (See
the object-oriented interface.)
.IP "\(bu" 4
\&\f(CW\*(C`literal_canonical_safe($lit)\*(C'\fR
.Sp
As per \f(CW\*(C`literal_canonical\*(C'\fR, but in the case where a literal is not a valid lexical
form, simply returns the original literal.
.IP "\(bu" 4
\&\f(CW\*(C`literal_valid($lit)\*(C'\fR
.Sp
Returns true iff the literal is a valid lexical form for its datatype. An example of
an invalid literal might be:
.Sp
.Vb 1
\& "2011\-02\-29"^^xsd:date
.Ve
.IP "\(bu" 4
\&\f(CW\*(C`literals_identical($lit1, $lit2)\*(C'\fR
.Sp
Returns true iff the two literals are identical according to \s-1OWL 2 RL.\s0 Here are some
example pairs that are identical:
.Sp
.Vb 3
\& # integers and decimals are drawn from the same pool of values
\& "1.000"^^xsd:decimal
\& "1"^^xsd:integer
\&
\& # different ways of writing the same datetime
\& "2010\-01\-01T12:00:00.000Z"^^xsd:dateTime
\& "2010\-01\-01T12:00:00+00:00"^^xsd:dateTime
.Ve
.Sp
Here are some example literals that are not identical:
.Sp
.Vb 3
\& # floats and decimals are drawn from different pools of values
\& "1.000"^^xsd:float
\& "1"^^xsd:integer
\&
\& # according to OWL 2 these are "equal but not identical".
\& "2010\-01\-01T12:00:00+00:00"^^xsd:dateTime
\& "2010\-01\-01T11:00:00\-01:00"^^xsd:dateTime
.Ve
.Sp
This latter example is affected by \f(CW\*(C`force_utc\*(C'\fR.
.IP "\(bu" 4
\&\f(CW\*(C`literal_to_perl($lit)\*(C'\fR
.Sp
Returns a scalar value for the literal, or an appropriate object with overloaded operators
(e.g. DateTime, Math::BigInt).
.PP
Variables \f(CW$RDF\fR, \f(CW$RDFS\fR, \f(CW$OWL\fR and \f(CW$XSD\fR may also be exported
as a convenience. These are RDF::Trine::Namespace objects. Don't
modify them.
.SS "Object-Oriented Interface"
.IX Subsection "Object-Oriented Interface"
.Vb 2
\& use RDF::Trine;
\& use RDF::Closure::DatatypeHandling qw[$XSD];
\&
\& my $lit = RDF::Trine::Node::Literal\->new(
\& "2010\-01\-01T11:00:00\-01:00", undef, $XSD\->dateTime);
\& my $handler = RDF::Closure::DatatypeHandling\->new(force_utc => 1);
\& print $handler\->literal_canonical($lit)\->as_ntriples;
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
RDF::Closure.
.PP
.
.SH "AUTHOR"
.IX Header "AUTHOR"
Toby Inkster .
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2011 Ivan Herman
.PP
Copyright 2011\-2012 Toby Inkster
.PP
This library is free software; you can redistribute it and/or modify it
under any of the following licences:
.IP "\(bu" 4
The Artistic License 1.0 .
.IP "\(bu" 4
The \s-1GNU\s0 General Public License Version 1 ,
or (at your option) any later version.
.IP "\(bu" 4
The W3C Software Notice and License .
.IP "\(bu" 4
The Clarified Artistic License .
.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