Re: [xtm-wg] XTM-CMS: Topic associations

[Lars Marius Garshol <larsga@garshol.priv.no>]

* Dale Hunscher
|
| 1. A definition of the association *class* (or template might be a
| better word) such that it has the required anchor roles "husband"
| and "wife"; possibly each could allow multiple instances to account
| for polygamy and polyandry.

* Michel Biezunski
|
| It's already covered :
| - The association type is a topic. When you say "is-married-to",
| "is-married-to" is
|    not a string, it is the reference to a topic, whose id is
| "is-married-to", but could be
|    as well "xxx-3u934h" and this topic has among his various names one which
| is
|    "is-married-to". This takes care of the class issue.

It does not really, since there is currently no way of saying "all
instances of the is-married-to' association must have exactly one
'husband' anchor role and one 'wife' anchor role".

So while you can certainly specify class membership in the current
standard, you can not restrict the structure of class instances in any
way.

| - Now, if you want to say something about an instance of the
| marriage, e.g.  the one between John and Jackie Kennedy, you
| consider that the association you are talking about is an occurrence
| of the topic "Marriage of John and Jackie Kennedy", that might have
| many other occurrences elsewhere, a definition, an identity, etc.

In theory this is possible, but is there any software that actually
implements this? If so, how is it implemented? Also, the standard does
not say anything about what implications this has for the data model
or how such special-case occurrences are to be treated.

So I'm not sure that this can really be done in any useful way at the
moment.
 
| The difference is that in the class case, the topic representing the
| class is automatically generated within the topic map, 

What do you mean by this?

--Lars M.


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