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Re: [dxwg] Profile negotiation [RPFN]

From: Lars G. Svensson via GitHub <sysbot+gh@w3.org>
Date: Mon, 11 Jun 2018 18:44:11 +0000
To: public-dxwg-wg@w3.org
Message-ID: <issue_comment.created-396345175-1528742650-sysbot+gh@w3.org>
And now I comment myself...
> (@agreiner ) Can you explain the value that you see in having the same URL for both
datasets?

At this level I'm not concerned with datasets but with arbitrary entities (identified by URIs) that can have 1..n representations (also identified by URIs that in most cases are also URLs). And from my point of view the entities belong to one `dcat:Dataset`. The representations of those entities (e. g. modelled using `profile-1` and serialised as `text/turtle`, or modelled using `profile-2` and serialised as `application/ld+json`) can then be collected and publshed as `dcat:Distribution`s of the said `dcat:Dataset`.

> (@RubenVerborgh ) I.e., for the same reason that we link to http://dbpedia.org/resource/Marie_Curie
instead of http://dbpedia.org/data/Marie_Curie.json
or http://dbpedia.org/page/Marie_Curie,
since the first URL can be used for clients of any kind,
whereas the two others are specific to certain types of client.

> Furthermore, the first URL remains valid
if new representations are added in the future.

+1

> (@RubenVerborgh ) Nitpick: you call them "both datasets", implying that they are different datasets.
While we probably shouldn't get too philosophical on what a dataset is and isn't,
but Lars described his case as:

>>>  data about the same entities (e. g. persons and geographic entities) but using two different metadata profiles.

> so the dataset seemed the same.

Yes, from my POV the entities are in the same dataset but the different representations are in different distributions.

> (@agreiner) To me, that suggests that they are really two different resources

It's all about the same August Rodin, identified by http://d-nb.info/gnd/118601717. And, as Ruben stated, there are several resources that work as representations of Rodin (or the metadata about him). They are targetted at different audiences and thus have different profiles, but they are still describing (representing) the same entity. So if you wish you can see this as a move towards entity-based identification as opposed to representation-based identification.

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