2005-02-23
Rather than concerning themselves unduly with hewing to existing ontologies, Berners-Lee pushed developers to start using RDF and triples more aggressively. In particular, he wants to see existing databases exported as RDF, with ontologies created ad-hoc to match the structure of that data. Rather than using PHP scripts only to produce HTML, he suggested, create RDF as well. Then, when all of the RDF is aggregated, apply rules and see what happens. "Let's not fall back on handmade markup."
DQL was first released in Jena 1.2.0. At the time of writing, the following systems are known to provide RDQL: there is no formal compliance test but all these systems implement something around the triple pattern matching and constraint system that they can be described as "RDQL". They are all (to the authors knowledge) derived from the original grammar [5]. Jena RDFStore Sesame PHP XML Classes 3Store RAP - RDF API for PHP In addition, RDQL is one language used for remote query by the Joseki RDF Server.