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::redland::query

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

NAME

       RDF::Redland::Query - Redland RDF Syntax Query Class

SYNOPSIS

	 use RDF::Redland;

	 ...
	 my $query=new RDF::Redland::Query($query_string); # default query language
	 my $results=$query->execute($model);
	 # or my $results=$model->query_execute($query);
	 while(!$results->finished) {
	   for (my $i=0; $i < $results->bindings_count(); $i++) {
	     my $name=$results->binding_name($i);
	     my $value=$results->binding_value($i);
	     # ... do something with the results
	   }
	   $results->next_result;
	 }

DESCRIPTION

       This class represents queries of various syntaxes over an RDF::Redland::Model returning a sequence of results that (currently) bind
       variable names to RDF::Redland::Node values.

CONSTRUCTORS

       new QUERY-STRING [BASE-URI [QUERY-LANG-URI [QUERY-LANG]]]
	   Create a new RDF::Redland::Query object for a query string QUERY-STRING with optional base URI BASE-URI IN QUERY language QUERY-LANG or
	   query language URI QUERY-LANG-URI (both can be undef).  If QUERY-LANG-URI is omitted, the current directory is used as the base URI.
	   If QUERY-LANG-NAME is undef, the default query language "rdql" is used.  If BASE-URI is omitted, no base URI is used.

METHODS

       execute MODEL
	   Run the query against model MODEL returning a RDF::Redland::QueryResults object or undef on failure.

SEE ALSO

       RDF::Redland::QueryResults

AUTHOR

       Dave Beckett - http://www.dajobe.org/

perl v5.14.2							    2011-02-04						  RDF::Redland::Query(3pm)

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