[Go-essp-tech] replicas and search

[stephen.pascoe at stfc.ac.uk]

I don't see why we need to "store files inside the triple store".
Surely all we need is a triple of the sort:

<DRS-URL> esg:hasTrackingId <trackingId>

Maybe each DRS-URL is associated with more than one file and therefore
there will be more than one triple per DRS-URL but I think it would
still do the job.

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: 02 December 2009 17:06
To: Don Middleton
Cc: go-essp-tech at ucar.edu
Subject: Re: [Go-essp-tech] replicas and search

Hi Don,
	from Bryan's use case, it seemed to me that he already knew
which gateway to consult...
But I do agree that we will not be able to perform file-searches across
the federation based on the RDF metadata, it has been long known that we
don't want to store files inside the triple stores because of
performance issues. Obviously, if this use case is really important,
each gateway could expose a web service to perform this kind of queries
in a distributed fashion.
thanks, Luca


On Dec 2, 2009, at 9:47 AM, 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?
>
> 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>
>> _______________________________________________
>> GO-ESSP-TECH mailing list
>> GO-ESSP-TECH at ucar.edu
>> http://mailman.ucar.edu/mailman/listinfo/go-essp-tech
>

_______________________________________________
GO-ESSP-TECH mailing list
GO-ESSP-TECH at ucar.edu
http://mailman.ucar.edu/mailman/listinfo/go-essp-tech
-- 
Scanned by iCritical.