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Re: Survey paper

From: Cory Henson <coryhenson@gmail.com>
Date: Thu, 13 Aug 2009 09:48:09 -0400
Message-ID: <bc34b7450908130648s6c5ceae5o77bb3c674afa161e@mail.gmail.com>
To: Simon Cox <simon.cox@jrc.ec.europa.eu>
Cc: Michael.Compton@csiro.au, public-xg-ssn@w3.org
Understand, but wanted to make the jump to the data level so that I could
ask how these were translated to RDF.  Perhaps I was sloppy in the example
and relied too heavily on the semantics of "..." (or too lazy to write a lot
of XML :)  Below may be a better translation:

<Description rdf:about="#foo" rdf:type="CompositePhenomenon ">
...
   <component rdf:resource="http://example.org/R3"/>
...
</Description>
<Description rdf:about="#R3_inst" rdf:type="R3">
   <value>42.0</value>
</Description>


On Thu, Aug 13, 2009 at 9:30 AM, Simon Cox <simon.cox@jrc.ec.europa.eu>wrote:

>  Ah - I wonder if there is some crossed wires here.
> Phenomenon and SWE Records are at different meta-levels, and appear in
> different places in the O&M model.
>
> 1. The Phenomenon schema/model provides for the description of a phenomenon
> type.
> The 'observed-property' in O&M-speak. A column-heading in a conventional
> tabular representation of a data-set.
>
> 2. the SWE Common schema provides for records to contain values.
> The 'result' in O&M-speak. A cell contents in a conventional tabular
> representation.
>
> There is a link, of course, and a swe: record will typically point to the
> Phenomenon instance that describes its structure and meaning.
> But you do not find a swe:value inside a Phenomenon instance.
>
>
> Simon Cox
>
> European Commission, Joint Research Centre,
> Institute for Environment and Sustainability,
> Spatial Data Infrastructures Unit, TP 262
> Via E. Fermi, 2749, I-21027 Ispra (VA), Italy
> Tel: +39 0332 78 3652
> Fax: +39 0332 78 6325
> mailto:simon.cox@jrc.ec.europa.eu <simon.cox@jrc.ec.europa.eu>
> http://ies.jrc.ec.europa.eu/simon-cox
>
> SDI Unit: http://sdi.jrc.ec.europa.eu/
> IES Institute: http://ies.jrc.ec.europa.eu/
> JRC: http://www.jrc.ec.europa.eu/
>
>
>  ------------------------------
> *From:* public-xg-ssn-request@w3.org [mailto:public-xg-ssn-request@w3.org]
> *On Behalf Of *Cory Henson
> *Sent:* Thursday, 13 August 2009 15:20
>
> *To:* Simon Cox
> *Cc:* Michael.Compton@csiro.au; public-xg-ssn@w3.org
> *Subject:* Re: Survey paper
>
> Simon,
>
> How are data values translated to RDF? For example,
>
> <CompositePhenomenon gml:id="foo">
> ...
>    <component xlink:href='http://example.org/R3'/<http://example.org/R3%27/>
> >
> ...
> </CompositePhenomenon>
> ...
> <swe:encoding>
>    <swe:AsciiBlock decimalSeparator="." tokenSeparator=",",
> tupleSeparator=" "/>
> </swe:encoding>
> ...
> <swe:value>
>    ... 42.0 ...
> </swe:value>
>
> to
>
> <Description rdf:about="#foo" rdf:type="CompositePhenomenon ">
> ...
>    <component rdf:resource="http://example.org/R3"/>
> ...
> </Description>
> <Description rdf:about="#R3" rdf:type="...">
>    <value>42.0</value>
> </Description>
>
>
> I know there are different record formats (<swe:record>) that may be more
> easily annotated, and thus provide a more clear translation, but in general
> is there a standard way to map the values to RDF?
>
> -Cory
>
>
> On Thu, Aug 13, 2009 at 8:44 AM, Simon Cox <simon.cox@jrc.ec.europa.eu>wrote:
>
>>  'model reference to a ontological description' vs 'composition by
>> inclusion of remote resources'
>>
>> Not sure. The emphasis is a little different.
>> I understand the intention of 'annotation' is to add some richer
>> description, as an adjunct to something local.
>> The intention of the latter is not to have anything local, just a pointer
>> to a remote resource.
>> Augmenting vs deferring the description.
>>
>> The mapping to RDF is straightforward.
>> GML was actually modelled on the RDF meta-model (though the XML syntax is
>> not the same - that's history).
>> Lower-case XML elements (e.g. component) are RDF properties, while the
>> upper-case XML elements (e.g. CompositePhenomenon) are RDF Resources.
>> So when you see
>>
>> <CompositePhenomenon gml:id="foo">
>> ...
>>    <component xlink:href='http://example.org/R3'/<http://example.org/R3%27/>
>> >
>> ...
>> </CompositePhenomenon>
>>
>> think
>>
>> <Description rdf:about="#foo" rdf:type="CompositePhenomenon ">
>> ...
>>    <component rdf:resource"http://example.org/R3"/>
>> ...
>> </Description>
>>
>> or
>>
>>  <Description rdf:about="#foo" rdf:type="CompositePhenomenon ">
>> ...
>>    <component>
>>       <Description rdf:about="http://example.org/R3"
>> rdf:type="SimplePhenomenon>
>>        ... stuff ...
>>       </Description>
>>    </component>
>> ...
>> </Description>
>>
>> (Apologies for the dodgy RDF/XML.)
>>
>>
>>
>> Simon Cox
>>
>> European Commission, Joint Research Centre,
>> Institute for Environment and Sustainability,
>> Spatial Data Infrastructures Unit, TP 262
>> Via E. Fermi, 2749, I-21027 Ispra (VA), Italy
>> Tel: +39 0332 78 3652
>> Fax: +39 0332 78 6325
>> mailto:simon.cox@jrc.ec.europa.eu <simon.cox@jrc.ec.europa.eu>
>> http://ies.jrc.ec.europa.eu/simon-cox
>>
>> SDI Unit: http://sdi.jrc.ec.europa.eu/
>> IES Institute: http://ies.jrc.ec.europa.eu/
>> JRC: http://www.jrc.ec.europa.eu/
>>
>>
>>  ------------------------------
>> *From:* public-xg-ssn-request@w3.org [mailto:public-xg-ssn-request@w3.org]
>> *On Behalf Of *Cory Henson
>> *Sent:* Thursday, 13 August 2009 14:27
>> *To:* Simon Cox
>> *Cc:* Michael.Compton@csiro.au; public-xg-ssn@w3.org
>> *Subject:* Re: Survey paper
>>
>>   Hi Simon,
>>
>> Thanks for the comment.  We are using the term semantic annotation as
>> described in SAWSDL, as a model reference to a ontological description.
>> Does this conflict with the description as a 'composition by inclusion of
>> remote resources'? As far as mapping to RDF, this is in comparison to RDFa
>> which has a known syntactic translation from the set of annotations to RDF
>> triples. While xlink:href maps to rdf:resource, how would the values of
>> properties of this resource be translated to RDF? If this is not correct, or
>> the wording is awkward, please point us in the right direction.  Thanks for
>> your help.
>>
>> -Cory
>>
>>
>> On Thu, Aug 13, 2009 at 8:01 AM, Simon Cox <simon.cox@jrc.ec.europa.eu>wrote:
>>
>>> Hi Mike -
>>>
>>> A clarification relating to semantic annotations and xlink:
>>>
>>> In GML-style XML documents, xlink:href plays the same role as
>>> rdf:resource
>>> in an RDF/XML document.
>>> I.e. it holds a pointer to external resource, which could be pasted
>>> inline
>>> as an anonymous node with equivalent semantics.
>>> This is a basic GML pattern and is explained in the GML spec
>>> http://portal.opengeospatial.org/files/?artifact_id=20509 clause 7.2.3.
>>> The examples involving xlink:href in Figure 2 aren't exactly
>>> 'annotations',
>>> more 'composition by inclusion of remote resources'.
>>>
>>> So I'm not sure if the example supports the point you are making.
>>>
>>> You comment 'XLink has no predefined mapping to RDF.'
>>> As mentioned above, _as used in GML documents_ xlink:href maps to
>>> rdf:resource.
>>>
>>> Simon Cox
>>>
>>> European Commission, Joint Research Centre,
>>> Institute for Environment and Sustainability,
>>> Spatial Data Infrastructures Unit, TP 262
>>> Via E. Fermi, 2749, I-21027 Ispra (VA), Italy
>>> Tel: +39 0332 78 3652
>>> Fax: +39 0332 78 6325
>>> mailto:simon.cox@jrc.ec.europa.eu
>>> http://ies.jrc.ec.europa.eu/simon-cox
>>>
>>> SDI Unit: http://sdi.jrc.ec.europa.eu/
>>> IES Institute: http://ies.jrc.ec.europa.eu/
>>> JRC: http://www.jrc.ec.europa.eu/
>>>
>>> -----Original Message-----
>>> From: public-xg-ssn-request@w3.org [mailto:public-xg-ssn-request@w3.org]
>>> On
>>> Behalf Of Michael.Compton@csiro.au
>>> Sent: Thursday, 13 August 2009 13:43
>>> To: public-xg-ssn@w3.org
>>> Subject: Survey paper
>>>
>>> Hi all,
>>>
>>> Sorry it's so close to the SSN'09 deadline, but with help from Cory and
>>> Holger, I (finally) have a survey paper.  Please read, comment, etc.
>>>
>>> (there are a couple of obvious tweaks/FIXME's yet to be made)
>>>
>>> Michael
>>>
>>>
>>>
>>
>>
>> --
>> Cory Andrew Henson
>> Kno.e.sis Center, Wright State University
>> http://knoesis.wright.edu/researchers/cory/
>>
>
>
>
> --
> Cory Andrew Henson
> Kno.e.sis Center, Wright State University
> http://knoesis.wright.edu/researchers/cory/
>



-- 
Cory Andrew Henson
Kno.e.sis Center, Wright State University
http://knoesis.wright.edu/researchers/cory/
Received on Thursday, 13 August 2009 13:48:53 GMT

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