Re: Progress on Time deliverable

Thanks for this Simon, do you think it would be possible to use some of the
next plenary to discuss your contributions - or would you prefer a
dedicated call ?

Ed


On Mon, 16 May 2016 at 00:29 Rob Atkinson <rob@metalinkage.com.au> wrote:

> Hi Simon,
>
> Not sure if this is a "between the cracks" issue, or if you have
> considered this and have some advice...
>
> I am trying to determine an appropriate practice for using the time
> ontology in the context of a RDF Datacube dimension specialisation, as per
> https://www.w3.org/TR/vocab-data-cube/#dsd-dimensions.
>
> This is a requirement implicit in the SDW charter
> "The WG will develop a formal Recommendation for expressing discrete
> coverage data conformant to the ISO 19123
> <http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=40121>
>  abstract model. Existing standard and *de facto* ontologies will be
> examined for applicability; these will include the RDF Data Cube
> <https://www.w3.org/TR/vocab-data-cube/>. "
>
> Noting however that AFAICT there has yet to be a treatment of using
> RDF-Datacube to express the metadata need to use WCS or similar API -
> instead the discussion has so far related to prior experiences trying to
> serialise the data into RDF.  Defining dimensions using a formalism such as
> RDF-datacube does not imply any particular encoding of the data, or even
> the encoding of the metadata.
>
> The SDW-BP makes multiple mentions of examples of using time and spatial
> objects in RDF datacube dimensions, without addressing the implication that
> where applicable concepts should be exposed as skos:Concepts, From my
> reading of these various pieces there seems to be a missing piece which
> relates to the application of the Time ontology to the definition of
> instances exposed as skos:Concepts, or appropriate measures that allow for
> typical hierarchical  year/month/day etc applications.
>
> Where in the SDW does the Use Case of defining a temporal dimension get
> addressed?
>
> cheers
> Rob Atkinson
>
>
> On Mon, 16 May 2016 at 08:28 <Simon.Cox@csiro.au> wrote:
>
>> Dear WG –
>>
>>
>>
>> Apologies for the silence relating to progress on the OWL-Time
>> deliverable.
>>
>>
>>
>> I can now report that a complete working draft is available in the Github
>> repository, or in formatted view here: http://w3c.github.io/sdw/time/
>>
>>
>>
>> So far all that has been done is to take the 2006 Working Draft by Hobbs
>> and Pan, re-arrange it to be a bit more systematic, and make modifications
>> relating to TRS support that were described in my paper and briefed to the
>> group I think three times now. The RDF version of the ontology has not yet
>> been loaded into a W3C location, but the CSIRO-hosted version from the
>> paper is available here: http://def.seegrid.csiro.au/ontology/time/new
>> I’m not sure what the protocol is for loading an update over the existing
>> version, but I guess it would be premature until we are a lot further along
>> in the process.
>>
>>
>>
>> I have retained some of the language from the 2006 version, but it is
>> distributed in various places in the new document.
>>
>> I also retained most of the examples – these have not been re-written at
>> all, yet. I have added some new examples, some from my paper, and a new
>> example using the ProperInterval class for the geologic time scale, to
>> illustrate both the temporal topology handling, and also the TRS support.
>>
>>
>>
>> I’ve worked essentially by myself to get to this point - Chris has no
>> responsibility for any errors. But thought it was worth advising the WG of
>> this progress as it is now respectable enough to look at. Chris and I (and
>> anyone else who is interested!) will now go back to the UCR document and
>> consider what additional work is required.
>>
>>
>>
>> Simon
>>
>>
>>
>> *Simon J D Cox *
>>
>> Research Scientist
>>
>> Environmental Informatics
>>
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>>
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>>
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>>
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*Ed Parsons *FRGS
Geospatial Technologist, Google

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