Supported specifications

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This page summarizes the specifications Comunica implements.

Query standards

The following standard query specifications are supported:

Description
SPARQL 1.1 Query Language
SPARQL 1.1 Update
SPARQL 1.1 Service Description
SPARQL 1.1 Federated Query
SPARQL 1.1 Query Results JSON Format
SPARQL Query Results XML Format (Second Edition)
SPARQL 1.1 Query Results CSV and TSV Formats
SPARQL 1.1 Protocol
SPARQL next SEP 0002 - Excluding ADJUST function
RDF-star and SPARQL-star

The following notable specifications are not supported yet:

Description
SPARQL 1.1 Entailment Regimes
SPARQL 1.1 Graph Store HTTP Protocol

SPARQL query results can be serialized in different formats. For all of these supported formats, the following are standards:

Media type	Description
`application/sparql-results+json`	The SPARQL/JSON results format.
`application/sparql-results+xml`	The SPARQL/XML results format.
`text/csv`	The SPARQL/CSV results format.
`text/tab-separated-values`	The SPARQL/TSV results format.

All serializers work in a streaming manner.

Next to these, RDF serializations are supported, as shown below.

RDF triples/quads can be serialized via the following RDF serializations:

Media type	Description
`application/trig`	The TriG RDF serialization.
`application/n-quads`	The N-Quads RDF serialization.
`text/turtle`	The Turtle RDF serialization.
`application/n-triples`	The N-Triples RDF serialization.
`text/n3`	The Notation3 serialization.
`application/ld+json`	The JSON-LD RDF serialization.

All serializers work in a streaming manner.

RDF triples/quads can be provided as input via the following RDF serializations:

Name	Media type	Extensions
TriG	`application/trig`	`.trig`
N-Quads	`application/n-quads`	`.nq`, `.nquads`
Turtle	`text/turtle`	`.ttl`, `.turtle`
N-Triples	`application/n-triples`	`.nt`, `.ntriples`
Notation3	`text/n3`	`.n3`
JSON-LD	`application/ld+json`, `application/json`	`.json`, `.jsonld`
RDF/XML	`application/rdf+xml`	`.rdf`, `.rdfxml`, `.owl`
RDFa and script RDF data tags HTML/XHTML	`text/html`, `application/xhtml+xml`	`.html`, `.htm`, `.xhtml`, `.xht`
RDFa in SVG/XML	`image/svg+xml`,`application/xml`	`.xml`, `.svg`, `.svgz`
Microdata	`text/html`, `application/xhtml+xml`	`.html`, `.htm`, `.xhtml`, `.xht`

All parsers work in a streaming manner.

Alignment with other JavaScript libraries is achieved via the following RDF/JS specifications:

Description
RDF/JS Query specification
RDF/JS Stream interfaces specification
RDF/JS Data model specification