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On 11/16/12 11:27 PM, John F Sowa
wrote:
But the SPARQL people keep saying that they "interoperate" with SQL
because they can convert an RDB to a bunch of triples. The people
with triple stores who make a profit support SQL -- because that's
what the programmers ask for.
No this isn't the claim. There are two orthogonal initiatives on
this front:
1. R2RML -- a syntax for mapping relational database hosted data to
RDF model based entity relationship graphs
2. SPARQL -- an intensional query language for query RDF model based
entity relationship graphs (which includes transient or matrialized
views of relational DBMS hosted data; ditto other RDF and non data
sources) .
Today, as I've demonstrated many times [3], you can make transient
and materialized RDF views over ODBC or JDBC accessible relational
database hosted data [1]. In addition, you now have the ability to
query the same data intensionally (via SPARQL) and extensionally
(via SQL). It's a win for all, it exemplifies the vital points
you've repeatedly about legacy data integration.
In addition, syntaxes like Turtle are making it easier for people to
deconstruct the relational database realm in general (a 40+ year old
black box of ever diminishing utility in today's big data realm)
i.e, the realization that relational Tables and Views are also
simply documents that sit behind the aforementioned black boxes
(delivering query processing and indexing functionality at
exorbitant prices).
It's been an odyssey for sure, but we are very close to what you
seek re. better acknowledgement and incorporation of legacy
technology re. Semantic Web oriented endeavors :-)
Links:
1. http://www.w3.org/TR/r2rml/ -- R2RML
2. http://www.w3.org/TR/rdf-sparql-query/ -- SPARQL
3. http://bit.ly/RtdGjA -- understanding Co-Relational view of data
4. http://www.slideshare.net/kidehen/iswc-2012-linked-data-meetup --
deconstructing big data, linked data, rdf, and the semantic web
5. http://bit.ly/YTdz3N -- Peter Chen's 1976 dissertation re. Entity
Relationship Model and Unified Views of Data
6.
http://bit.ly/NC1yaP -- Deconstructing the Database (presentation by
Rich Hickey -- creator of Cojure) .
--
Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
Personal Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca handle: @kidehen
Google+ Profile: https://plus.google.com/112399767740508618350/about
LinkedIn Profile: http://www.linkedin.com/in/kidehen
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