Building Time Aware Applications in RDF

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01-22-2009

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Building Time Aware Applications in RDF

HPL-2009-6 Building Time Aware Applications in RDF - McBride, Brian
Keyword(s): semantic web, temporal RDF, temporal query, temporal modeling, temporal application.
Abstract: Several techniques for using RDF to model change over time in a domain are reviewed and a new approach with a lower triple count than previous approaches is described. It is argued that the application programmer requires tool support so that she does not have to deal with the details of the modelin ...
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rdf::query::node

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

NAME

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

VERSION

       This document describes RDF::Query::Node version 2.908.

METHODS

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

       "compare ( $a, $b )"
	   Returns -1, 0, or 1 if $a is less than, equal to, or greater than $b, respectively, according to the SPARQL sorting rules.

       "from_trine ( $node )"
	   Returns a new RDF::Query::Node object with the same value as $node, a RDF::Trine::Node object. This essentially promotes $node to a
	   node object with extra functionality provided by the RDF::Query package (like SPARQL-defined ordering).

       "explain"
	   Returns a string serialization of the node appropriate for display on the command line. This method is primarily used by the "explain"
	   method of the subclasses of RDF::Query::Plan.

FUNCTIONS

       "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">.

       "iri ( $iri )"
	   Returns a RDF::Query::Node::Resource object with the given IRI value.

       "blank ( $id )"
	   Returns a RDF::Query::Node::Blank object with the given identifier.

       "literal ( $value, $lang, $dt )"
	   Returns a RDF::Query::Node::Literal object with the given value and optional language/datatype.

       "variable ( $name )"
	   Returns a RDF::Query::Node::Variable object with the given variable name.

AUTHOR

	Gregory Todd Williams <gwilliams@cpan.org>

perl v5.14.2							    2012-01-31						     RDF::Query::Node(3pm)

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