Final answer:
SPARQL 1.1 supports XML, JSON, and CSV/TSV formats for returning query results. These formats are used for SELECT and ASK query forms, while CONSTRUCT and DESCRIBE return RDF graphs serialized in formats like RDF/XML, Turtle, or N-Triples.
Step-by-step explanation:
SPARQL 1.1, an RDF query language, supports standardized formats for returning query results that are crucial for sharing and reusing data on the Semantic Web. The supported standardized formats include XML, JSON, and CSV/TSV. These formats allow for easy integration with existing tools and enhance interoperability between different systems.
When using SPARQL 1.1, the SELECT and ASK query forms return results in XML or JSON, with the results returned as a table or boolean value respectively. For the SELECT queries, results can include variables and their corresponding values. Additionally, the CONSTRUCT and DESCRIBE forms return RDF graphs, which are typically serialized in an XML-based format known as RDF/XML, or alternatively, in other RDF serialization formats such as Turtle or N-Triples.
Example
If you execute a SPARQL SELECT query and want to receive the results in JSON, you would specify 'application/sparql-results+json' in the HTTP Accept header. Conversely, to receive the results in XML, you would specify 'application/sparql-results+xml'.