1RDF::Trine::Model(3) User Contributed Perl Documentation RDF::Trine::Model(3)
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6 RDF::Trine::Model - Model class
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9 This document describes RDF::Trine::Model version 1.019
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12 "new ( $store )"
13 Returns a new model over the supplied rdf store or a new temporary
14 model. If you provide an unblessed value, it will be used to
15 create a new rdf store.
16 "temporary_model"
18 Returns a new temporary (non-persistent) model.
19 "dataset_model ( default => \@dgraphs, named => \@ngraphs )"
21 Returns a new model object with the default graph mapped to the
22 union of the graphs named in @dgraphs, and with available named
23 graphs named in @ngraphs.
24 "begin_bulk_ops"
26 Provides a hint to the backend that many update operations are
27 about to occur. The backend may use this hint to, for example,
28 aggregate many operations into a single operation, or delay index
29 maintenence. After the update operations have been executed,
30 "end_bulk_ops" should be called to ensure the updates are committed
31 to the backend.
32 "end_bulk_ops"
34 Provides a hint to the backend that a set of bulk operations have
35 been completed and may be committed to the backend.
36 "logger ( [ $logger ] )"
38 Returns the logging object responsible for recording data inserts
39 and deletes.
40 If $logger is passed as an argument, sets the logger to this
42 object.
43 "add_statement ( $statement [, $context] )"
45 Adds the specified $statement to the rdf store.
46 "add_hashref ( $hashref [, $context] )"
48 Add triples represented in an RDF/JSON-like manner to the model.
49 See "as_hashref" for full documentation of the hashref format.
51 "add_iterator ( $iter )"
53 Add triples from the statement iterator to the model.
54 "add_list ( @elements )"
56 Adds an rdf:List to the model with the given elements. Returns the
57 node object that is the head of the list.
58 "get_list ( $head )"
60 Returns a list of nodes that are elements of the rdf:List
61 represented by the supplied head node.
62 "remove_list ( $head [, orphan_check => 1] )"
64 Removes the nodes of type rdf:List that make up the list.
65 Optionally checks each node before removal to make sure that it is
66 not used in any other statements. Returns false if the list was
67 removed completely; returns the first remaining node if the removal
68 was abandoned because of an orphan check.
69 "get_sequence ( $seq )"
71 Returns a list of nodes that are elements of the rdf:Seq sequence.
72 "remove_statement ( $statement [, $context])"
74 Removes the specified $statement from the rdf store.
75 "remove_statements ( $subject, $predicate, $object [, $context] )"
77 Removes all statements matching the supplied $statement pattern
78 from the rdf store.
79 "size"
81 Returns the number of statements in the model.
82 "etag"
84 If the model is based on a store that has the capability and
85 knowledge to support caching, this method returns a persistent
86 token that will remain consistent as long as the store's data
87 doesn't change. This token is acceptable for use as an HTTP ETag.
88 "supports ( [ $feature ] )"
90 If $feature is specified, returns true if the feature is supported
91 by the underlying store, false otherwise. If $feature is not
92 specified, returns a list of supported features.
93 "count_statements ( $subject, $predicate, $object )"
95 Returns a count of all the statements matching the specified
96 subject, predicate and objects. Any of the arguments may be undef
97 to match any value.
98 "get_statements ($subject, $predicate, $object [, $context] )"
100 Returns an iterator of all statements matching the specified
101 subject, predicate and objects from the rdf store. Any of the
102 arguments may be undef to match any value.
103 If three or fewer arguments are given, the statements returned will
105 be matched based on triple semantics (the graph union of triples
106 from all the named graphs). If four arguments are given (even if
107 $context is undef), statements will be matched based on quad
108 semantics (the union of all quads in the underlying store).
109 "get_pattern ( $bgp [, $context] [, %args ] )"
111 Returns a stream object of all bindings matching the specified
112 graph pattern.
113 If $context is given, restricts BGP matching to only quads with the
115 $context value.
116 %args may contain an 'orderby' key-value pair to request a specific
118 ordering based on variable name. The value for the 'orderby' key
119 should be an ARRAY reference containing variable name and direction
120 ('ASC' or 'DESC') tuples. A valid %args hash, therefore, might
121 look like "orderby => [qw(name ASC)]" (corresponding to a SPARQL-
122 like request to 'ORDER BY ASC(?name)').
123 "get_sparql ( $sparql )"
125 Returns a stream object of all bindings matching the specified
126 graph pattern.
127 "get_graphs"
129 "get_contexts"
130 Returns an iterator containing the nodes representing the named
131 graphs in the model.
132 "as_stream"
134 Returns an iterator containing every statement in the model.
135 "as_hashref"
137 Returns a hashref representing the model in an RDF/JSON-like
138 manner.
139 A graph like this (in Turtle):
141 @prefix ex: <http://example.com/> .
143 ex:subject1
145 ex:predicate1
146 "Foo"@en ,
147 "Bar"^^ex:datatype1 .
148 _:bnode1
150 ex:predicate2
151 ex:object2 ;
152 ex:predicate3 ;
153 _:bnode3 .
154 Is represented like this as a hashref:
156 {
158 "http://example.com/subject1" => {
159 "http://example.com/predicate1" => [
160 { 'type'=>'literal', 'value'=>"Foo", 'lang'=>"en" },
161 { 'type'=>'literal', 'value'=>"Bar", 'datatype'=>"http://example.com/datatype1" },
162 ],
163 },
164 "_:bnode1" => {
165 "http://example.com/predicate2" => [
166 { 'type'=>'uri', 'value'=>"http://example.com/object2" },
167 ],
168 "http://example.com/predicate2" => [
169 { 'type'=>'bnode', 'value'=>"_:bnode3" },
170 ],
171 },
172 }
173 Note that the type of subjects (resource or blank node) is
175 indicated entirely by the convention of starting blank nodes with
176 "_:".
177 This hashref structure is compatible with RDF/JSON and with the
179 ARC2 library for PHP.
180 "as_graphviz"
182 Returns a GraphViz object of the RDF graph of this model, ignoring
183 graph names/contexts.
184 This method will attempt to load the GraphViz module at runtime and
186 will fail if the module is unavailable.
187 Node-Centric Graph API
189 "subjects ( $predicate, $object )"
190 Returns a list of the nodes that appear as the subject of
191 statements with the specified $predicate and $object. Either of the
192 two arguments may be undef to signify a wildcard.
193 "predicates ( $subject, $object )"
195 Returns a list of the nodes that appear as the predicate of
196 statements with the specified $subject and $object. Either of the
197 two arguments may be undef to signify a wildcard.
198 "objects ( $subject, $predicate [, $graph ] [, %options ] )"
200 Returns a list of the nodes that appear as the object of statements
201 with the specified $subject and $predicate. Either of the two
202 arguments may be undef to signify a wildcard. You can further
203 filter objects using the %options argument. Keys in %options
204 indicate the restriction type and may be 'type', 'language', or
205 'datatype'. The value of the 'type' key may be one of 'node',
206 'nil', 'blank', 'resource', 'literal', or 'variable'. The use of
207 either 'language' or 'datatype' restrict objects to literal nodes
208 with a specific language or datatype value, respectively.
209 "objects_for_predicate_list ( $subject, @predicates )"
211 Given the RDF::Trine::Node objects $subject and @predicates, finds
212 all matching triples in the model with the specified subject and
213 any of the given predicates, and returns a list of object values
214 (in the partial order given by the ordering of @predicates).
215 "bounded_description ( $node )"
217 Returns an RDF::Trine::Iterator::Graph object over the bounded
218 description triples for $node (all triples resulting from a graph
219 traversal starting with "node" and stopping at non-blank nodes).
220 "as_string"
222
224 Please report any bugs or feature requests to through the GitHub web
225 interface at <https://github.com/kasei/perlrdf/issues>.
226
228 Gregory Todd Williams "<gwilliams@cpan.org>"
229
231 Copyright (c) 2006-2012 Gregory Todd Williams. This program is free
232 software; you can redistribute it and/or modify it under the same terms
233 as Perl itself.
234perl v5.30.1 2020-01-30 RDF::Trine::Model(3)