- From: Ruben Verborgh <ruben.verborgh@ugent.be>
- Date: Mon, 25 Aug 2014 15:28:05 +0200
- To: Gregg Kellogg <gregg@greggkellogg.net>
- Cc: public-sparql-dev@w3.org, public-rdfjs@w3.org
Hi Gregg, > Any thoughts on executing the parse result? Yes. The current Linked Data Fragments client [1] uses a precursor of this parse result to execute SPARQL queries over Triple Pattern Fragment. I will upgrade it to the new SPARQL.js library ASAP. However, it is not a complete SPARQL executor yet. > From my experience in the Ruby implementation, this is where the Algebra really comes into play, as it becomes directly executable, and forms patterns that can be used for algebraic optimization. When implementing this parser, my main doubt was: should I translate to SPARQL algebra, or use a JSON format that better resembles the original query? I eventually opted for that last solution, because my experience implementing the aforementioned executor was generally positive with that simple JSON format. I think it might be less scary for people who want a simple first experience with SPARQL in JavaScript. Also see Claus' comment on this thread: >> The syntax level is perfectly fine. >> The Apache Jena framework also separates between the syntax and the algebra level, and offers transformations between the two represenatations. That said, a more complex query executor would definitely benefit from SPARQL algebra. If I would build this, I'm unsure whether to start from the Jison document or to simply transform the current generated JSON. Best, Ruben [1] https://github.com/LinkedDataFragments/Client.js
Received on Monday, 25 August 2014 13:28:42 UTC