SPARQL

SPARQL is the product of the RDF Data Access Working Group.

The SPARQL specification provides a full description of the language and provides many examples. This page provides a crash course to SPARQL.

DataSet: An RDF dataset is an unnamed graph and a collection of named graphs.  A SPARQL query is acting over a single dataset. The simple case is of a single graph.

Graph Patterns: a query pattern is made from a number of building blocks:

• Basic patterns - a number of triple patterns
• OPTIONALs -
• Alternatives
• Constraints

Result forms

• SELECT
• CONSTRUCT
• DESCRIBE
• ASK

ARQ Documentation Home Page