3.1 SPARQL Service Description Namespace and OWL Ontology
The SPARQL service description namespace IRI is:
http://www.w3.org/ns/sparql-service-description#
The prefix used in this document for this namespace is sd.
An RDF encoding of the Service Description ontology is available by HTTP content negotiation from the namespace IRI.
3.2 Properties
3.2.1 sd:endpoint
Relates an instance of sd:Service to a SPARQL endpoint that implements the SPARQL Protocol service [SPROT] for the service. The object of the sd:endpoint property is an IRI.
| type: | owl:InverseFunctionalProperty |
|---|
| domain: | sd:Service |
|---|
3.2.2 sd:feature
Relates an instance of sd:Service with a resource representing a supported feature.
3.2.3 sd:defaultEntailmentRegime
Relates an instance of sd:Service with a resource representing an entailment regime used for basic graph pattern matching. This property is intended for use when a single entailment regime by default applies to all graphs in the default dataset of the service. In situations where a different entailment regime applies to a specific graph in the dataset, the sd:entailmentRegime property should be used to indicate this fact in the description of that graph.
3.2.4 sd:entailmentRegime
Relates a named graph description with a resource representing an entailment regime used for basic graph pattern matching over that graph.
3.2.6 sd:supportedEntailmentProfile
Relates a named graph description with a resource representing a supported profile of the entailment regime (as declared by sd:entailmentRegime) used for basic graph pattern matching over that graph.
3.2.8 sd:extensionAggregate
Relates an instance of sd:Service to an aggregate that may be used in a SPARQL aggregate query (for instance in a HAVING clause or SELECT expression) besides the standard list of supported aggregates COUNT, SUM, MIN, MAX, AVG, GROUP_CONCAT, and SAMPLE.
3.2.9 sd:languageExtension
Relates an instance of sd:Service to a resource representing an implemented extension to the SPARQL Query or Update language.
3.2.10 sd:supportedLanguage
Relates an instance of sd:Service to a SPARQL language (e.g. Query and Update) that it implements.
3.2.11 sd:propertyFeature
Relates an instance of sd:Service to a resource representing an implemented feature that extends the SPARQL Query or Update language and that is accessed by using the named property.
3.2.12 sd:defaultDataset
Relates an instance of sd:Service to a description of the default dataset available when no explicit dataset is specified in the query, update request or via protocol parameters.
3.2.13 sd:availableGraphs
Relates an instance of sd:Service to a description of the graphs which are allowed in the construction of a dataset via the SPARQL Protocol, with FROM/FROM NAMED clauses in a query, or with USING/USING NAMED in an update request, if the service limits the scope of dataset construction.
3.2.16 sd:defaultGraph
Relates an instance of sd:Dataset to the description of its default graph.
3.2.17 sd:namedGraph
Relates an instance of sd:GraphCollection (or its subclass sd:Dataset) to the description of one of its named graphs. The description of such a named graph MUST include the sd:name property and MAY include the sd:graph property.
3.2.18 sd:name
Relates a named graph to the name by which it may be referenced in a FROM/FROM NAMED clause. The object of the sd:name property is an IRI.
3.2.19 sd:graph
Relates a named graph to its graph description.
3.3 Classes
3.3.1 sd:Service
An instance of sd:Service represents a SPARQL service made available via the SPARQL Protocol.
3.3.7 sd:EntailmentProfile
An instance of sd:EntailmentProfile represents a profile of an entailment regime. An entailment profile MAY impose restrictions on what constitutes valid RDF with respect to entailment. URIs for commonly used entailment profiles are defined by Unique URIs for OWL 2 Profiles [OWL2PROF].
3.3.10 sd:Graph
An instance of sd:Graph represents the description of an RDF graph.
This document does not define properties with domain sd:Graph. Instead, such instances may be described using other appropriate vocabularies (see example below).
3.3.11 sd:NamedGraph
An instance of sd:NamedGraph represents a named graph having a name (via sd:name) and an optional graph description (via sd:graph).
3.4 Instances
3.4.5 sd:UnionDefaultGraph
sd:UnionDefaultGraph, when used as the object of the sd:feature property, indicates that the default graph of the dataset used during query and update evaluation (when an explicit dataset is not specified) is comprised of the union of all the named graphs in that dataset.
3.4.7 sd:EmptyGraphs
sd:EmptyGraphs, when used as the object of the sd:feature property, indicates that the underlying graph store supports empty graphs. A graph store that supports empty graphs MUST NOT remove graphs that are left empty after triples are removed from them. (See 3.1 Graph Update in SPARQL 1.1 Update.)
3.4.9 Other Instances
Apart from the instances listed above, custom extensions and other documents may define further instance URIs usable within service descriptions; the following documents also list instance URIs that may be used with some of the properties defined in the previous sections: