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Re: Quick Poll

From: Hugh Glaser <hugh@glasers.org>
Date: Fri, 23 Jan 2015 17:59:06 +0000
Cc: W3C LOD Mailing List <public-lod@w3.org>
Message-Id: <81039374-1735-4FEC-9033-3549F2E5F146@glasers.org>
To: Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk>
Thanks, and thanks for all the answers so far.

> On 23 Jan 2015, at 16:23, Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk> wrote:
> Not sure where you are going, but you are probably interested in
> linksets - as a way to package equivalence relations - typically in a
> graph of its own.
Thanks - I have a lot of linksets :-)
> http://www.w3.org/TR/void/#describing-linksets
> To answer the questions:
> Q1: d) in subject, property, object, or multiple of those.
I don’t understand where property comes in for using owl:sameAs (or whatever) in stating equivalence between URIs, so I’ll read that as c)
> Q2: No. We already reuse existing vocabularies and external
> identifiers, and there could be a nested structure which is only
> indirectly connected to "our" URIs.
I realise that this second question wasn’t as clear as it might have been.
What I meant was concerned with the sameAs triples only (as was explicit for Q1).
So, to elaborate, if you have decided that:
http://mysite.com/foo, http://dbpedia.org/resource/foo, http://rdf.freebase.com/ns/m.05195d8
are aligned (the same), then what do the triples describing that look like?
In particular, do you have any that look like
<http://dbpedia.org/resource/foo> owl:sameAs <http://rdf.freebase.com/ns/m.05195d8> .
(or vice versa), or do you equivalent everything to a “mysite” URI?

But I guess for OpenPHACTS this doesn’t apply, since I understand from what you say below that you never mint a URI of your own where you know there is an external one.
Although it does beg the question, perhaps, of what you do when you alter find equivalences.

> <http://example.com/our/own> pav:authoredBy
> <http://orcid.org/0000-0001-9842-9718> .
> <http://orcid.org/0000-0001-9842-9718> foaf:name "Stian Soiland-Reyes" .
> It's true you would also get the second triple from ORCID (remember
> content negotiation!), but it's very useful for presentation and query
> purposes to include these directly, e.g. in a VOID file.
> In most cases we do however not have any "our URIs" except for
> provenance statements. But perhaps Open PHACTS is special in that
> regard as we are integrating other people's datasets and shouldn't be
> making up any data of our own. :)
> Perhaps also of interest:
> In the Open PHACTS project <http://www.openphacts.org/> we use this
> extensively - we let the end-user choose which linksets of weak and
> strong equivalences they want to apply when a query is made. Such a
> collection of linksets and their application we call a "lense" - so
> you apply lenses to merge/unmerge your data. See
> http://www.slideshare.net/alasdair_gray/gray-compcoref
> In our identity mapping service
> <http://www.openphacts.org/about-open-phacts/how-does-open-phacts-work/identities-within-open-phacts>
> we pass in several parameters - the minimal is the URI to map.
> See http://openphacts.cs.man.ac.uk:9092/QueryExpander/mapURI and use
> http://rdf.ebi.ac.uk/resource/chembl/targetcomponent/CHEMBL_TC_2443 as
> the URI.
> We also have a piece of magic that can rewrite a SPARQL query to use
> the mapped URIs for a given variable (adding FILTER statements) try -
> http://openphacts.cs.man.ac.uk:9092/QueryExpander/
> On 23 January 2015 at 11:39, Hugh Glaser <hugh@glasers.org> wrote:
>> I would be really interested to know, please.
>> I suggest answers by email, and I’ll report back eventually.
>> Here goes:
>> Imagine you have some of your own RDF using URIs on your base/domain.
>> And you have reconciled some of your URIs against some other stuff, such as dbpedia, freebase, geonames...
>> Now, visualise the owl:sameAs (or skos:whatever) triples you have made to represent that.
>> Q1: Where are your URIs?
>> a) subject, b) object, c) both
>> Q2: Do all the triples have one of your URIs in them?
>> a) yes, b) no
>> It’s just for a choice I have about the input format for sameAs services, so I thought I would ask :-)
>> Best
>> Hugh
>> --
>> Hugh Glaser
>>   20 Portchester Rise
>>   Eastleigh
>>   SO50 4QS
>> Mobile: +44 75 9533 4155, Home: +44 23 8061 5652
> -- 
> Stian Soiland-Reyes, eScience Lab
> School of Computer Science
> The University of Manchester
> http://soiland-reyes.com/stian/work/    http://orcid.org/0000-0001-9842-9718

Hugh Glaser
   20 Portchester Rise
   SO50 4QS
Mobile: +44 75 9533 4155, Home: +44 23 8061 5652
Received on Friday, 23 January 2015 17:59:32 UTC

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