1RDF::Query::ServiceDescUrsieprtiCoonn(t3r)ibuted Perl DoRcDuFm:e:nQtuaetriyo:n:ServiceDescription(3)
2
3
4

NAME

6       RDF::Query::ServiceDescription - Class for describing federated query
7       data sources.
8

VERSION

10       This document describes RDF::Query::ServiceDescription version 2.918.
11

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.
17
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.
21
22       "url"
23           Returns the endpoint URL of the service.
24
25       "size"
26           Returns the number of triples the service claims to have.
27
28       "label"
29           Returns the label of the service.
30
31       "definitive"
32           Returns true if the endpoint claims to have definitive information.
33
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:
39
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             $capability->{pred} # RDF::Trine::Node::Resource
44
45       "patterns"
46           Returns an ARRAY reference of
47           RDF::Query::Algebra::BasicGraphPattern objects representing common
48           patterns used by the endpoint.
49
50       "computed_statement_generator"
51           Returns a closure appropriate for passing to
52           "RDF::Query->add_computed_statement_generator" to generate
53           statement iterators for the remote service.
54
55           This closure takes "($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 ]".
60
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.
64

AUTHOR

66        Gregory Todd Williams <gwilliams@cpan.org>
67
68
69
70perl v5.30.0                      2019-07-26 RDF::Query::ServiceDescription(3)
Impressum