Great, Richard, congratulations on this improvement!
I'm very thrilled to see how D2Rq is going forward!
Cheers,
--
diogo patrão
On Tue, Dec 4, 2012 at 8:41 PM, Richard Cyganiak <[email protected]>wrote:
> Hi all,
>
> A preview build of a D2RQ version with R2RML support is available on the
> download page.
> https://github.com/d2rq/d2rq/downloads
>
> IMPORTANT: This is a preview only, and in no way ready for anything
> resembling production use.
>
>
> R2RML is W3C's new standard database-to-RDF mapping language. For more on
> R2RML, see here:
> http://www.w3.org/TR/r2rml/
>
> In this D2RQ preview version, R2RML mappings can be used with dump-rdf,
> d2r-server and d2r-query, using the usual syntax. D2RQ will detect whether
> the mapping file is using R2RML or the "normal" D2RQ mapping language.
>
> This preview still has many known limitations. Most notably, SPARQL
> evaluation is dead slow, as a naive translator is used. The
> generate-mapping tool cannot produce R2RML yet. Also, rr:RefObjectMap not
> yet implemented.
>
>
> This version also includes a major, not yet quite completed, rewrite of
> the D2RQ engine. The goals of this rewrite were:
>
> 1. Supporting both R2RML and the D2RQ mapping language in a single engine
>
> 2. Making information about column datatypes and about
> primary/unique/foreign keys available throughout the engine so that we can
> do a better job at query optimization in future releases
>
> 3. Enable support for nested SQL queries so that we can do a better job at
> translating nested SPARQL language features in future releases
>
> 4. Remove eight years of cruft from the codebase :-)
>
> Aside from the R2RML support, this rewrite offers little immediate benefit
> to users, but it removes some design flaws and limitations from the
> codebase that have held us back, and it should pay off handsomely in the
> mid-term.
>
>
> The source code is in the new "develop" branch on GitHub.
>
>
> Work on the R2RML implementation is part of a collaboration with UCB:
> http://www.ucbpharma.co.uk/_up/ucbpharma_co_uk/documents/UCB_DERI.pdf
>
>
> All the best,
> Richard
>
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