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RDQL

The RDQL language is based on the earlier work of Guha’s RDFDB QL and SquishQL, with some relatively minor differences. Its popularity is ensured because of its use within Jena, probably the most widely used RDF API.

RDQL supports the different clauses of select, from, where, and using (with some exceptions) as SquishQL. Additionally, RDQL can change based on the implementation and whether you’re using a Java API such as Jena, a PHP class such as the PHP XML classes, or a Perl module such as RDFStore. However, though the syntax varies within the clauses, the concepts remain the same.

Variables are in the format of a question mark, followed by other characters, just as in SquishQL:


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