rdf::query::servicedescription(3pm) [debian man page]

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

NAME

       RDF::Query::ServiceDescription - Class for describing federated query data sources.

VERSION

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

METHODS

       "new ( $service_uri, %data )"
       "new_from_uri ( $url )"
	   Creates a new service description object using the DARQ-style service description data located at $url.

       "new_with_model ( $model )"
	   Creates a new service description object using the DARQ-style service description data loaded in the supplied $model object.

       "url"
	   Returns the endpoint URL of the service.

       "size"
	   Returns the number of triples the service claims to have.

       "label"
	   Returns the label of the service.

       "definitive"
	   Returns true if the endpoint claims to have definitive information.

       "capabilities"
	   Returns an ARRAY reference of capabilities (as HASH references) of the service.  Each capability will contain information on size,
	   selectivity, any subject-object filter, and required predicate, with the following classes:

	     $capability->{object_selectivity} # RDF::Trine::Node::Literal xsd:double
	     $capability->{sofilter} # RDF::Query::Expression
	     $capability->{size} # RDF::Trine::Node::Literal xsd:integer
	     $capability->{pred} # RDF::Trine::Node::Resource

       "patterns"
	   Returns an ARRAY reference of RDF::Query::Algebra::BasicGraphPattern objects representing common patterns used by the endpoint.

       "computed_statement_generator"
	   Returns a closure appropriate for passing to "RDF::Query->add_computed_statement_generator" to generate statement iterators for the
	   remote service.

	   This closure takes "($query, $bridge, \%bound, $subj, $pred, $obj [, $context ] )" as arguments and returns either "undef" if no
	   statements can be generated given the arguments, or a "RDF::Trine::Iterator::Graph" iterator containing statements matching "$subj,
	   $pred, $obj [, $context ]".

       "answers_triple_pattern ( $triple )"
	   Returns true if the service described by this object can answer queries comprised of the supplied triple pattern.

AUTHOR

	Gregory Todd Williams <gwilliams@cpan.org>

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

RDF::Trine::Graph(3pm)					User Contributed Perl Documentation				    RDF::Trine::Graph(3pm)

NAME

       RDF::Trine::Graph - Materialized RDF Graphs for testing isomorphism

VERSION

       This document describes RDF::Trine::Graph version 1.000

SYNOPSIS

	 use RDF::Trine::Graph;
	 my $a = RDF::Trine::Graph->new( $model_a );
	 my $b = RDF::Trine::Graph->new( $model_b );
	 print "graphs are " . ($a->equals( $b ) ? "the same" : "different");

DESCRIPTION

       RDF::Trine::Graph provdes a mechanism for testing graph isomorphism based on graph triples from either a RDF::Trine::Model or a
       RDF::Trine::Iterator.  Isomorphism testing requires materializing all of a graph's triples in memory, and so should be used carefully in
       situations with large graphs.

METHODS

       "new ( $model )"
       "new ( $iterator )"
	   Returns a new graph from the given RDF::Trine::Model or RDF::Trine::Iterator::Graph object.

       "equals ( $graph )"
	   Returns true if the invocant and $graph represent two equal RDF graphs (e.g.  there exists a bijection between the RDF statements of
	   the invocant and $graph).

       "is_subgraph_of ( $graph )"
	   Returns true if the invocant is a subgraph of $graph. (i.e. there exists an injection of RDF statements from the invocant to $graph.)

       "injection_map ( $graph )"
	   If the invocant is a subgraph of $graph, returns a mapping of blank node identifiers from the invocant graph to $graph as a hashref.
	   Otherwise returns false. The solution is not always unique; where there exist multiple solutions, the solution returned is arbitrary.

       "split_blank_statements"
	   Returns two array refs, containing triples with blank nodes and triples without any blank nodes, respectively.

       "get_statements"
	   Returns a RDF::Trine::Iterator::Graph object for the statements in this graph.

       "error"
	   Returns an error string explaining the last failed "equal" call.

BUGS

       Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/perlrdf/issues>.

AUTHOR

       Gregory Todd Williams  "<gwilliams@cpan.org>"

COPYRIGHT

       Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms
       as Perl itself.

perl v5.14.2							    2012-06-29						    RDF::Trine::Graph(3pm)