Dear Roy and John,
There are a lot of issues when we want to perform mappings between
vocabularies that are continuously evolving, for example GCMD, CF and
BODC.
OWL is a very good mechanism to express mappings, but the
vocabularies are not originally in OWL. This is the reason that we
have some tools at MMI to do an automatic conversion of this
vocabularies to OWL. That way we have them all harmonized (expressed
in the same language/format) and we can resolve semantic
heterogeneities in a better fashion.
I just make publicly available the plan of a strategy we have in
mind at MMI. It is here:
http://marinemetadata.org/examples/mmihostedwork/ontologieswork/
watchdogstrategy/strategyt
I have made some tests and look at a more concrete framework to allow
the representation and mapping of these terms by using SKOS : http://
www.w3.org/2004/02/skos/.
John and Roy, maybe we can talk in more detail what are your ideas
and make a plan to move this forward. I'll be glad to know if the MMI
strategy sounds reasonable and if more people are interested in
participating.
Best Regards,
Luis
On Apr 6, 2006, at 12:14 AM, Roy Lowry wrote:
> Hello John,
>
> Mapping CF Standard names to GCMD Parameter Valids to the public
> domain 'variable' level shouldn't be a problem as the GCMD
> vocabulary is clearly a discovery vocabulary. The issues Bryan is
> eluding to result from trying to map a usage vocabulary (one
> containing terms that fully describe a data value) because vital
> information for the mapping (e.g. whether a value is a mean or a
> standard deviation) are held in CF fields other than the Standard
> Name.
>
> Are you aware of the MMI vocabulary mapping workshop that was held
> in Boulder last August? CF was one of the vocabs used, but the
> work really only scratched the surface looking at maybe half a
> dozen terms. There should still be an OWL version of CF on the MMI
> site (as well as GCMD), but this will a snapshot that is now well
> out of date. There is however an open source tool to convert the
> XML to OWL (voc2OWL) and a very neat mapping tool (VINE). The
> resulting map is an OWL file that can be used with web services
> also provided by MMI to build a thesaurus server. I would strongly
> recommend their approach.
>
> The one issue with the GCMD parameter valids that was never
> properly sorted at Boulder is that the mapping was done to GCMD
> variable terms without their overlying term hierarchy, which took
> no account of the fact that EARTH SCIENCE > Biosphere > Animal
> Taxonomy > Fish and EARTH SCIENCE > Oceans > Marine Biology > Fish
> are different. I know Luis Bermudez of MMI was looking at this
> issue, but don't know how far he got.
>
> Building an ontology mapping between CF and GCMD was on my agenda
> for later this year to provide the capability to NDG for entering a
> CF Standard Name into a discovery portal and finding DIFs marked up
> using GCMD parameter valids. But I'm more than happy for someone
> else to make a start and would of course be happy to help once the
> time slot I've allocated for later this year comes around.
>
> Cheers, Roy.
>
>>>> John Caron <caron at unidata.ucar.edu> 4/5/2006 8:51:15 pm >>>
> Is the standard name table in XML at:
>
> http://www.cgd.ucar.edu/cms/eaton/cf-metadata/standard_name.xml
>
> being kept resonably up-to-date?
>
> I'm thinking about using it to map to, eg DIF vocabulary. Has
> anyone else done any mappings like that?
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---------------------------------------
Luis Bermudez Ph.D.
Software Engineer
MMI Liaison -
http://marinemetadata.org
bermudez at mbari.org
Tel: (831) 775-1929
Monterey Bay Aquarium Research Institute
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