Re: Restpark - Minimal RESTful API for querying RDF triples

[Kingsley Idehen]

On 4/16/13 5:22 PM, Aidan Hogan wrote:

On 16/04/2013 22:05, Kingsley Idehen wrote:

On 4/16/13 4:15 PM, Aidan Hogan wrote:

The ability to answer "I don't know" or "cannot compute right now" or
"I need more time" would make anything trivially scalable. But "I
don't know" or "cannot compute" or "I need more time" is not a valid
SPARQL answer. Nor is stopping after the first X answers are returned.

Let's have a constructive conversation via SPARQL protocol URLs.

Anyways, as per my previous reply ...

With respect to this SPARQL query service:

    http://lod.openlinksw.com/sparql



    SELECT * WHERE
    {?s foaf:knows ?o}

or

    SELECT * WHERE
    {?s foaf:knows ?o . ?o foaf:knows ?o2 .}

Cheers,
Aidan

I thought my comments were constructive? (If not, I'd be happy to hear why not.) I would like a response complaint with the SPARQL standard for either of the following two SPARQL queries:

Did you perform a count on either? If so, why no LIMIT in the query ? If you want no LIMIT into what bucket are you placing the result? Would you dare send the following to a decently sized RDBMS and use it as the basis for assessing scale:

SELECT * FROM TABLE_X

Anyway, re. my comments above,  SPARQL Protocol URLs:

1. http://lod.openlinksw.com/c/GNC4S3R -- query result re. count
2. http://lod.openlinksw.com/c/GSNV76O -- query definition re. the above.

So what do you do when the result set exceeds the capacity of the bucket? You make a scrollable cursor (the types vary: snapshot, keyset, dynamic, or mixed model) and then page through the data. Alternatively, you make a multi-dimensional view (known as facets in the RDF / Semantic Web UI world) and you leverage the entity relationship semantics as the basis for a scrollable cursor. The paragraph above describes what's happening at: http://lod.openinksw.com/fct -- its a scrollable cursor engine, something that's quite common in the RDBMS realm, but they lack relation semantics of RDF. Same thing applies to column-storage, key compression, and vectorized execution which are also reapplications of RDBMS realm technology in new RDF context so that we have the best of both worlds.

--

Regards,

Kingsley Idehen 
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
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