1RDF::Query::ServiceDescUrsieprtiCoonn(t3r)ibuted Perl DoRcDuFm:e:nQtuaetriyo:n:ServiceDescription(3)
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NAME

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

10       This document describes RDF::Query::ServiceDescription version 2.918.
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METHODS

13       "new ( $service_uri, %data )"
14       "new_from_uri ( $url )"
15           Creates a new service description object using the DARQ-style
16           service description data located at $url.
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18       "new_with_model ( $model )"
19           Creates a new service description object using the DARQ-style
20           service description data loaded in the supplied $model object.
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22       "url"
23           Returns the endpoint URL of the service.
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25       "size"
26           Returns the number of triples the service claims to have.
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28       "label"
29           Returns the label of the service.
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31       "definitive"
32           Returns true if the endpoint claims to have definitive information.
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34       "capabilities"
35           Returns an ARRAY reference of capabilities (as HASH references) of
36           the service.  Each capability will contain information on size,
37           selectivity, any subject-object filter, and required predicate,
38           with the following classes:
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40             $capability->{object_selectivity} # RDF::Trine::Node::Literal xsd:double
41             $capability->{sofilter} # RDF::Query::Expression
42             $capability->{size} # RDF::Trine::Node::Literal xsd:integer
43             $capability->{pred} # RDF::Trine::Node::Resource
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45       "patterns"
46           Returns an ARRAY reference of
47           RDF::Query::Algebra::BasicGraphPattern objects representing common
48           patterns used by the endpoint.
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50       "computed_statement_generator"
51           Returns a closure appropriate for passing to
52           "RDF::Query->add_computed_statement_generator" to generate
53           statement iterators for the remote service.
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55           This closure takes "($query, $bridge, \%bound, $subj, $pred, $obj
56           [, $context ] )" as arguments and returns either "undef" if no
57           statements can be generated given the arguments, or a
58           "RDF::Trine::Iterator::Graph" iterator containing statements
59           matching "$subj, $pred, $obj [, $context ]".
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61       "answers_triple_pattern ( $triple )"
62           Returns true if the service described by this object can answer
63           queries comprised of the supplied triple pattern.
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AUTHOR

66        Gregory Todd Williams <gwilliams@cpan.org>
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70perl v5.36.0                      2023-01-20 RDF::Query::ServiceDescription(3)
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