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Comments for the RDB2RDF Survey Report (as for 20090728)

From: Freddy Priyatna <fpriyatna@delicias.dia.fi.upm.es>
Date: Tue, 28 Jul 2009 18:46:42 +0200
Message-ID: <153747370907280946k6a7af8b8xcf9fa38e441745bc@mail.gmail.com>
To: public-xg-rdb2rdf <public-xg-rdb2rdf@w3.org>
Dear All,
My name is Freddy Priyatna, currently working in my master thesis
integrating Distributed Query Processor(DQP) with R2O+ODEMapster (one of the
tools mentioned in the Survey Report) in order to make it works with
multiple databases.

I've been reviewing the survey report (this version :
http://www.w3.org/2005/Incubator/rdb2rdf/RDB2RDF_SurveyReport_01082009.pdf) and
there are some comments that I would like to make :
1) In the comparison table (Query Implementation part), it mentions that R2O
works in "Both", which means that the SPARQL query can be executed directly
to the RDF repository or converted first to SQL then executed to RDB. In
reality, R2O only works in the second way, it always converts the SPARQL
into SQL first.
2) In fact, my previous point is not true. Rather than using SPARQL,
R2O(+ODEMapster) is using its own query, which is called "ODEMQL". We are in
the progress to enable R2O to support SPARQL.
3) There's a column in the table stating "Number of databases". I can't find
detail information about this column. Does "Multiple" value here mean that
the tool allow mapping from multiple databases? How about the query
processing? Does it support DQP as well?

Thank you
Best Regards
Freddy
Received on Tuesday, 28 July 2009 21:44:37 GMT

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