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Re: Clear illustration of how much confusion the use of two namespaces brings to the users. Was: SDW plenary agenda item - Namespace for SOSA and SSN ontology

From: Krzysztof Janowicz <janowicz@ucsb.edu>
Date: Wed, 22 Feb 2017 11:16:01 -0800
To: Maxime Lefrançois <maxime.lefrancois@emse.fr>, Armin Haller <armin.haller@anu.edu.au>, Raphaël Troncy <raphael.troncy@eurecom.fr>, "public-sdw-wg@w3.org" <public-sdw-wg@w3.org>
Message-ID: <afe2f920-e27e-0df2-ca33-015c43b1daad@ucsb.edu>
On 02/22/2017 03:47 AM, Maxime Lefrançois wrote:
> Dear Armin, Jano, all
>
> The confusion you just made about which namespace System is defined in 
> is very unfortunate,
>
> It illustrates perfectly the kind of confusion that I would like to 
> avoid for our end users.


I think we should not use a typo Armin made to make a point like this. 
This was not an issue of confusion, but simply a typo.


>
> If you two are confused once or twice with these two different 
> namespaces, how often do you think our end users will be confused  ?
>
> We are defining terms in one or the other namespace following some 
> logic that the lambda users will not grab at first.
>
> This is the main reason why I strongly encourage the choice of a 
> unique namespace, may it be SOSA or SSN.


For exactly this reason I would strongly favor two namespaces which is 
also the de-facto solution.

Best,
Jano



>
> To me,semantics and redirection issues should be put aside for now, as 
> they are tiny technical questions with respect to the aforementioned 
> usability issue.
>
> Kind regards,
> Maxime
>
>
> Le mer. 22 févr. 2017 à 03:39, Armin Haller <armin.haller@anu.edu.au 
> <mailto:armin.haller@anu.edu.au>> a écrit :
>
>     Krzysztof, thanks for pointing that out! That was indeed a
>     mistake, it should have read sosa:Platform and ssn:System. There
>     is no sosa:System in our current proposal. But tomorrow it is all
>     about the vote on the mechanics of the namespace for SOSA and SSN.
>
>     On 22/2/17, 11:27 am, "Krzysztof Janowicz" <janowicz@ucsb.edu
>     <mailto:janowicz@ucsb.edu>> wrote:
>
>         Just to avoid confusion. Armin is talking about ssn:System, not
>         sosa:System (which does not exist). The concept that does
>     exist in SOSA
>         is sosa:Platform.
>
>
>         On 02/21/2017 03:56 PM, Armin Haller wrote:
>         > Hi Raphaël,
>         >
>         > Thanks for your comment! In fact, the wiki is so detailed on
>     the mechanics is because we *only* want to vote on the mechanics
>     of the namespace issue tomorrow. The classes/properties that are
>     shown are only exemplative. We have separate issues around the
>     Platform and System class (i.e.
>     https://www.w3.org/2015/spatial/wiki/Platform). In fact, there is
>     a sosa:System and all current proposals under consideration in the
>     Platform/System issue do retain a sosa:System class in the core.
>     Please do ignore the modelling of those classes for tomorrow’s vote.
>         >
>         > Once we have come to a decision on the *mechanics* on how to
>     deal with namespaces we can tackle the remaining issues with the
>     architecture of the integration (see also
>     https://www.w3.org/2015/spatial/wiki/Proposals_for_rewriting_SSN),
>     i.e. essentially a decision on *reuse of classes/properties only
>     in SSN* or *equivalence/subclass/-property relationships in SSN to
>     SOSA classes/ property*.
>         >
>         > Cheers,
>         > Armin
>         >
>         > On 22/2/17, 10:24 am, "Raphaël Troncy"
>     <raphael.troncy@eurecom.fr <mailto:raphael.troncy@eurecom.fr>> wrote:
>         >
>         >      Dear Armin, all,
>         >
>         >      > If you have an opinion on this, please do have a
>     close look at the two
>         >      > options on our Wiki page that outline the
>     implementation implications of
>         >      > each option:
>     https://www.w3.org/2015/spatial/wiki/NamespaceIssue
>         >
>         >      I think that the two options are insufficiently
>     described in order to
>         >      make an informed decision (sections 3.1 and 3.2). There
>     is a lot of text
>         >      explaining the mechanics of content negotiation which
>     is sort of obvious
>         >      for anyone who is familiar with the linked data
>     concepts. On the
>         >      contrary, there is insufficient information on the bulk
>     of the issue,
>         >      i.e. what (concepts and properties) is defined where,
>     what is re-used,
>         >      what is being further defined with more axioms between
>     SOSA and (new) SSN.
>         >
>         >      In the current option 1, one can only see the
>     definition of a
>         >      sosa:Platform in the sosa namespace, while this concept
>     is further
>         >      axiomatized in ssn.ttl using the concept of ssn:System.
>     Does this mean
>         >      that there is no sosa:System?
>         >
>         >      I wish that the wiki page was not distracted by all the
>     mechanics of
>         >      trivial content negotiation and linked data terms
>     dereferencing, and
>         >      instead, focus on what is defined where precisely and
>     exhaustively.
>         >      Best regards.
>         >
>         >         Raphaël
>         >
>         >      --
>         >      Raphaël Troncy
>         >      EURECOM, Campus SophiaTech
>         >      Data Science Department
>         >      450 route des Chappes, 06410 Biot, France.
>         >      e-mail: raphael.troncy@eurecom.fr
>     <mailto:raphael.troncy@eurecom.fr> & raphael.troncy@gmail.com
>     <mailto:raphael.troncy@gmail.com>
>         >      Tel: +33 (0)4 - 9300 8242 <tel:04%2093%2000%2082%2042>
>         >      Fax: +33 (0)4 - 9000 8200 <tel:04%2090%2000%2082%2000>
>         >      Web: http://www.eurecom.fr/~troncy/
>     <http://www.eurecom.fr/%7Etroncy/>
>         >
>         >
>
>
>         --
>         Krzysztof Janowicz
>
>         Geography Department, University of California, Santa Barbara
>         4830 Ellison Hall, Santa Barbara, CA 93106-4060
>
>         Email: jano@geog.ucsb.edu <mailto:jano@geog.ucsb.edu>
>         Webpage: http://geog.ucsb.edu/~jano/
>     <http://geog.ucsb.edu/%7Ejano/>
>         Semantic Web Journal: http://www.semantic-web-journal.net
>
>
>


-- 
Krzysztof Janowicz

Geography Department, University of California, Santa Barbara
4830 Ellison Hall, Santa Barbara, CA 93106-4060

Email: jano@geog.ucsb.edu
Webpage: http://geog.ucsb.edu/~jano/
Semantic Web Journal: http://www.semantic-web-journal.net
Received on Wednesday, 22 February 2017 19:17:07 UTC

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