Queries

To invoke the query service, at least one query has to be specified. For example, using the default endpoint configuration the query

SELECT * {?s ?p ?o}

will result in the encoded URI

http://localhost:8267/services/sparql/query?query=SELECT%20*%20%7B?s%20?p%20?o%7D

Further examples are available at W3C SPARQL Protocol HTTP Examples.

More technically, the service supports both GET and POST requests. An overview of all of the parameters is provided in the following table:

Parameter	Type	Description
query	xsd:string	The SPARQL query (required)
default-graph-uri	xsd:anyURI	Explicitly set default graphs (0..n)
named-graph-uri	xsd:anyURI	Explicitly set named graphs (0..n)
debug	xsd:boolean	Switch to debug mode if true, i.e. show HTML based UI (optional)

If both by SPARQL query and via arguments default-graph-uri or named-graph-uri graphs are selected, the argument's definitions are used.

The query result will be returned in different formats, depending on the query form and HTTP content negotiation. In all cases UTF-8 is used as encoding.

SPARQL Query Form	Result Type	Result Format (MIME)
SELECT	Variable bindings	SPARQL Query Results XML Format (application/sparql-results+xml) as default or JSON (application/json)
ASK	Boolean value
CONSTRUCT	Graph	Turtle (text/turtle) as default or RDF/XML (application/rdf+xml)
DESCRIBE	Graph