RE: fixing ssn

Krzysztof,
Perhaps all this work was discussed in focus well before you became active in the ssn subgroup. It was indeed some time ago, ie more than 6 months ago,  but has sat still while the modularity design (yet to be tested by experimentation/implementation) ,   SOSA and IoT issues have been given more attention.

We are tasked to bring SSN to a standard, and to simplify and make it easier to use, especially by modularisation. An early  decision was made to separate dolce, and this was done at that time,  but it became apparent that something had gone wrong as we published it  in our FPWD, so I have done it again here  from scratch (with minor improvement -e.g. new dolce namespace). Given that SSN needs to be broken up (through horizontal and vertical modules, as extensively discussed, but with no resolution on how big/many of these there would be) , it would be very sad and painful  to do that from a base of an SSN now with  unintentional errors in it.   Certainly experimentation is needed, but a clean, common  base is surely a worthwhile thing to have.

Some of these problems (see below) were always there (and that is where I plan to work next, with the group's support).   This was discussed briefly in the last ssn meeting too, but is also on the agenda for the F2F. I hope we can focus there on the next steps for modularisation.

Does that address your concerns?

--Kerry
From: Krzysztof Janowicz [mailto:janowicz@ucsb.edu]
Sent: Monday, 12 September 2016 5:16 AM
To: Kerry Taylor <kerry.taylor@anu.edu.au>; public-sdw-wg@w3.org
Subject: Re: fixing ssn

Hi Kerry,

I am bit surprised by your message and what exactly it means. How does working on the old SSN align with SOSA and everything else we discussed over the past 6 months?

Best,
Krzysztof

On 09/11/2016 07:14 AM, Kerry Taylor wrote:
I have just "fixed"  the dolce removal from ssn. The version we were looking at on webprotege had some errors of uncertain provenance, so I went back to SSN  as it was left by the XG here https://www.w3.org/2005/Incubator/ssn/ssnx/ssn.owl  (more commonly known as http://purl.oclc.org/NET/ssnx/ssn) and removed dolce all over again. I also changed the ssn namespace to the new W3c one, and the dolce one to the new one http://www.ontologydesignpatterns.org/ont/dul/DUL.owl, and added some  annotation comments to reflect this.

We now have, on github, a new folder sdw/ssn/ssn_separated which contains ssn.owl<https://github.com/w3c/sdw/blob/gh-pages/ssn/ssn_separated/ssn.owl> and        dul-alignment.owl<https://github.com/w3c/sdw/blob/gh-pages/ssn/ssn_separated/dul-alignment.owl>   . The latter imports dolce but the former does not.   If you look at the alignment ontology you can see that ssn has lost a few important things that now cannot be said at all and will need to be natively  rebuilt,  in addition to the constraints that dolce gave it.

There are also a good few "bugs" remaining - but these are all original ssn bugs. I am thinking of a few things in annotations (including stuff we already changed in the web-protégé version) and a lot of typos, and at least one place where some class is explicitly subclassed from owl;thing.

I plan to gradually work through those bugs - and will bring to the attention of the list anything that is not either already decided or for which there is some choice about what to do.

If anyone would like to give it a once-over in case I have done something stupid, please do.

--Kerry






--

Krzysztof Janowicz



Geography Department, University of California, Santa Barbara

4830 Ellison Hall, Santa Barbara, CA 93106-4060



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