Roy,
This makes sense to me.
So wherever you need a UCD you can put an
rdf:id or rdf:resource that identifies a proper descriptive term
by URL.
At that URL is the OWL class within the class hierarchy and
with its
definition. There one can define the dimensional analysis of the item and
how it differs from similar terms.
However, one does not escape the painful reality that each concept
needs a name
and so one still needs to come up with agreement on these names. The only
advantage for this aspect is that one can reflect hierarchies in the directory
structure and the URL with the "/" symbol, as in http://ivoa.net/OWL/physics/StokesParameters/S0.owl
Ed
Roy Williams wrote:
>Sonali
>
>Thank you for your burst of cold reality in this increasingly abstract
>discussion. In debating the structure of UCD2, I have been continually
>thinking of you and others who build actual software that
>"understands" UCD.
>
>Unfortunately, I cannot answer your questions. I could simply say
>there will be a web service for doing the matching, but then you will
>say who and where and when. I do not know. Can I call here fo
>volunteers to make the UCD2 services? How soon?
>
>I am beginning to think that adopting UCD2 will require a lot of hard
>work by a lot of people -- data providers as well as consumers -- and
>I am not seeing the concrete and immediate benefits.
>
>Perhaps we should start working towards a very sophisticated RDF-based
>model ("UCD3") for alpha release in a year or two. But stay with a
>cleaned-up UCD1 for the near to medium term.
>
>Comments anyone?
>Roy
>
>--------
>Caltech Center for Advanced Computing Research
>roy-at-cacr.caltech.edu
>626 395 3670
>
>----- Original Message -----
>From: "Sonali A. Kale" <sonali-at-persistent.co.in>
>To: <ucd-at-ivoa.net>
>Sent: Wednesday, November 05, 2003 4:58 AM
>Subject: UCD matching function
>
>
>
>
>>Hello,
>>
>>Could someone throw light on the UCD matching
>>function ? Will there be separate parsers written for
>>the matching ? In VOPlot as of now, we use UCDs
>>to look for similar columns from another VOTable.
>>This is a simple string match, but I guess the matching
>>function for the new UCD system will be more complex.
>>
>>Will the matching be provided as a web service ? How
>>much data will a software have to carry with it for the
>>actual matching (if the matching is done by the software tool) ?
>>I am especially worried about this since VOPlot is an applet
>>and an applet with a heavy footprint will not be usable.
>>
>>I would really appreciate any help on this.
>>
>>- Thanks,
>>Sonali
>>------------------------------------
>>Sonali A. Kale
>>Persistent Systems Private Limited
>>http://www.persistent.co.in
>>Ph: +91 (20) 567 8900 (ext. 328)
>>------------------------------------
>>
>>
>>
>>
>
>
>
Received on 2003-11-05Z18:40:13