Hi John,
On Apr 6, 2006, at 3:29 PM, John Caron wrote:
> Hi Luis:
>
> Luis Bermudez wrote:
>> 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.
>
> So are you harvesting the CF at http://www.cgd.ucar.edu/cms/eaton/
> cf-metadata/standard_name.xml and converting to http://
> marinemetadata.org/2005/02/cf, or ?
Yes
>
>> That way we have them all harmonized (expressed in the same
>> language/format) and we can resolve semantic heterogeneities in a
>> better fashion.
>
> Can you explain what tools are needed to make these translation (or
> point me to some URL)? Do you need an OWL reasoning engine or can
> something simpler be used? Are there any working examples?
No, you don't need any reasoning engine to create the ontologies. I
use
http://marinemetadata.org/examples/mmihostedwork/ontologieswork/
voc2owl.
>
> What does the OWL need to look like? Are the files at:
>
> http://marinemetadata.org/2005/02/cf
> http://marinemetadata.org/2005/02/gcmd
>
> examples of what is needed?
Yes; however. GCMD has problems they way is currently encoded, since
some of the variables can appear in one ore more hierarchy tree (as
explain by Roy in a previous email). We have to find how to deal with
this issue.
>
>
>> 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.
>
> I would be happy to fit my efforts into your larger efforts, if
> possible. I will neeed to understand the requirements better,
> before I know for sure.
I think we can start with CF and GCMD, not worrying at the moment
about their continuous changing. Concrete actions:
- Agree on the properties that relate both of them. In the MMI
workshop we used : narrowerThan, sameAs and broaderThan
- Have a updated version of CF and GCMD in an ontology.
- Think what is the best way to solve the GCMD- hierarchy problem
- Start doing the mappings. We can use VINE for that purpose http://
marinemetadata.org/examples/mmihostedwork/ontologieswork/vine
-publish the mappings.
-Then of course we would like to make this a little bit more
operational, like having a real time representation of CF and GCMD
keywords in an ontology as well as their mappings.
Best Regards.
Luis
>
> Thanks!
>
>
>
>> 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
>>>>>> <mailto: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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>>> www.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>>
>>>
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>> ---------------------------------------
>> Luis Bermudez Ph.D.
>> Software Engineer
>> MMI Liaison - http://marinemetadata.org
>> bermudez at mbari.org <mailto:bermudez at mbari.org>
>> Tel: (831) 775-1929
>> Monterey Bay Aquarium Research Institute
Received on Fri Apr 07 2006 - 11:52:51 BST
