W3C home > Mailing lists > Public > semantic-web@w3.org > July 2007

URIs and Named Graphs

From: Hans Teijgeler <hans.teijgeler@quicknet.nl>
Date: Thu, 5 Jul 2007 13:57:04 +0200
To: "SW-forum" <semantic-web@w3.org>
Cc: "Paap, Onno" <onno.paap@gmail.com>
Message-ID: <000c01c7befb$9e468940$6c7ba8c0@hans>
We ran into a problem for which I ask advice from this esteemed forum.
First some background information: we use the SW technologies in conjunction
with a generic data model to create a distributed data base for each
engineering project, involving large numbers (in the hundreds) of quad
stores per project.
To give an example of using a data model "underneath" OWL: normally you may
see things like an <owl:Class rdf:ID="Car"/>. 
For us that would be: <part2:ClassOfInanimatePhysicalObject rdf:ID="Car"/>
where ClassOfInanimatePhysicalObject is an entity type in our data model and
an owl:Class.
If an application has data that must be shared, that data is mapped at the
source from its proprietary format to ISO 15926-7 format, and stored in a
quad store that we call a "Fašade". 
Only "owned" data are stored, other data a fetched with SPARQL for other
Data can be "handed over" to another Fašade, thus also handing over custody
for that data.
Quad stores that participate in a given project are known to a "CPF" server
(Confederation of Participating Fašades), where we distrubute SPARQL
queries, consolidate query results, whilst controling access rights.
For the Fašades we use RAP, and want to use the 4th column of their Named
Graphs for dividing the quad store into partitions like 'active data',
'archive', and the like. Actually we have nine such partitions, but I won't
annoy you with the details.
We use URI#fragID's all over the place.
The question is how we can dereference any such fragment identifiers inside
a particular partition without having to have nine endpoints (which is
costly and harder to manage).
It would be nice if we could use composite fragment identifiers like
URI#partition#fragID, but the second hash # would not be allowed. If we
would use something like URI#partition__fragID that would be well-formed,
but hardly usable with generic browsers (I guess).
Please shed some light on this.
Hans Teijgeler
ISO 15926 specialist
+31-72-509 2005
HYPERLINK "blocked::http://www.infowebml.ws/"www.InfowebML.ws 

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Received on Thursday, 5 July 2007 11:57:41 UTC

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