[topicmapmail] Default occurrence type in TMDM

[Robert Cerny]

Lars Marius Garshol wrote:
> * Robert Cerny
>>
>> -) If I would want to import a XTM 1.0 map into a TMDM store, it is 
>> one of the things that is referenced, and therefore must exist.
>
> This is kind of complicated to answer. Firstly, the only document that 
> says what XTM 1.0 means is the XTM 1.0 specification. The XTM 1.1 spec 
> (from before we upped the version number to 2.0) used to also define 
> the mapping from XTM 1.0 to TMDM, but it no longer does that.
>
> Now, there are two ways you could get a "default occurrence type" in 
> XTM 1.0:
>
>  (1) You create it yourself.
>
>  (2) You use an untyped occurrence. (XTM 1.0 specifies a default PSI for
>      this case.)
(1) is what I do right now.

(2) is unclear, because it is not an untyped occurrence when the type is 
a topic which reifies the subject "The concept of occurrence". The 
question is whether 
"http://www.topicmaps.org/xtm/1.0/core.xtm#occurrence" and 
"tm:occurrence-type" are PSIs for the same subject?

I just would prefer something to lean on, even if it is not a 100% and 
it might give in a little bit, than building something myself. So i 
rather have a complete set of stable PSIs (like in 2005-07-13) without 
the semantics between the subjects formalized, than not being able to 
refer to them at all. But i do understand that this is kind of dangerous.

By the way, when reading [1] again in the light of the new information 
you provided, many things cleared up and i was much happier reading it 
the second time :-)

[1] http://www.garshol.priv.no/blog/40.html

-- 
Robert Cerny
Software Development

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