[Go-essp-tech] replicas and search

[Luca Cinquini]

Hi Stephen,
	I guess the fundamental question is wether the trackingId is file- 
specific or dataset-specific. It is certainly possible to have a new  
RDF triple of the form:
(dataset, hasTrackingId, trackingId)
but we want to avoid having to start tracking ids for each file of  
each dataset, since datasets can potentially have many, many files (I  
assume this is still true?).
See below for your other related questions.
thanks, Luca

On Dec 3, 2009, at 4:03 AM, <stephen.pascoe at stfc.ac.uk> <stephen.pascoe at stfc.ac.uk 
 > wrote:

> Hi Luca,
>
> I've taken a look at the ontology in Protégé.  I see there is an  
> esg:Dataset class with some interesting properties:
>
> esg:hasUri
points to the full dataset URI, for example:
<esg:hasUri rdf:datatype="http://www.w3.org/2001/ 
XMLSchema#string">resource://ESG-NCAR/ID#test.dataset.0</esg:hasUri>

> esg:hasUUID
points to the dataset UUID, which is the database identifier, but we  
don't currently use it within an RDF context.
> esg:hasDataArchive
this property is actually obsolete, replaced by hasGateway
> esg:hasDataService
used to point to data access services of any kind, through the  
DatasetAccess object. Currently the ESG gateway does not store the URL  
of a THREDDS catalog, but it looks like we will probably have to do  
it, and if so we would use this property to store it in the RDF triple  
store.
>
> How are these used in ESG?  Do any of them map onto THREDDS URLs of  
> individual datasets?
> Maybe we could have a property esg:containsFileWithTrackingId?
>
> Cheers,
> Stephen.
>
>
> ---
> Stephen Pascoe  +44 (0)1235 445980
> British Atmospheric Data Centre
> Rutherford Appleton Laboratory
>
> -----Original Message-----
> From: go-essp-tech-bounces at ucar.edu [mailto:go-essp-tech-bounces at ucar.edu 
> ] On Behalf Of Luca Cinquini
> Sent: 03 December 2009 00:59
> To: Lawrence, Bryan (STFC,RAL,SSTD)
> Cc: go-essp-tech at ucar.edu
> Subject: Re: [Go-essp-tech] replicas and search
>
> Hi Bryan:
>
> On Dec 2, 2009, at 10:20 AM, Bryan Lawrence wrote:
>
>> On Wednesday 02 December 2009 16:47:02 Don Middleton wrote:
>>> A follow-on to the call, as I had to leave a bit early. We were
>>> discussing being able to use the tracking id for various files. If
>>> the tracking id is not in the federated metadata, how does one know
>>> which gateway to consult for information?
>>
>> I was wondering the same thing ...
>>
>> I think I've asked this question before, but I can't remember the
>> answer :-)
>>
>> Is the difference between what is in the Thredds catalog and what is
>> in the rdf representation of it documented anywhere?  (Or, where is
>> the schema for the rdf?)
>
> The schema for the RDF is the owl file itself:
>
> http://ontologies.ucar.edu/owl/esg.owl
>
> or if you want to look at all the ontologies in the package:
>
> http://ontologies.ucar.edu/owl/esg_all.owl
>
> Luca
>
>>
>> Cheers
>> Bryan
>>
>>>
>>> don
>>>
>>>
>>> On Dec 1, 2009, at 2:30 PM, Luca Cinquini wrote:
>>>
>>>> Hi,
>>>> 	as I mentioned today at the telecon, I think the RDF query  
>>>> services
>>>> should be able to handle the concept of dataset replicas quite
>>>> nicely. The main concepts are that the RDF records generated from
>>>> replicas must have different RDF identifiers, so they can be
>>>> exchanged independently among gateways, and must reference their
>>>> original RDF record.
>>>>
>>>> If you are interested, I've documented some of the details here:
>>>>
>>>> https://wiki.ucar.edu/display/esgcet/Metadata+Search+and+Replicas
>>>>
>>>> I'm also including a snapshot of an ESG Gateway that shows multiple
>>>> replicas returned as part of a DRS search (note that how the
>>>> replicas are presented in the result page can be easily changed -
>>>> the picture is just to show that the query can handle replicas).
>>>>
>>>> thanks, Luca
>>>>
>>>> <DRS with Replicas.tiff>
>>>> _______________________________________________
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>>>> GO-ESSP-TECH at ucar.edu
>>>> http://mailman.ucar.edu/mailman/listinfo/go-essp-tech
>>>
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>>>
>>
>>
>>
>> --
>> Bryan Lawrence
>> Director of Environmental Archival and Associated Research
>> (NCAS/British Atmospheric Data Centre and NCEO/NERC NEODC) STFC,
>> Rutherford Appleton Laboratory Phone +44 1235 445012; Fax ... 5848;
>> Web: home.badc.rl.ac.uk/lawrence
>
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