[topicmapmail] Zero or more roleplayers in XTM 1.0.1

[Lars Marius Garshol]

* Steve Pepper
|=20
| It was always the intention that it should be possible to specify a
| role without specifying the role players. The rationale is to be
| able to represent incomplete knowledge. (I know Marc is married, but
| I don't know who his wife is...)

Do note, however, that the decision we made in Montr=E9al was that in
these cases blank topics will be created on deserialization. So what
this means is that leaving out the topic reference is a shorthand for
creating a topic with no characteristics.

In LTM, which does not support this, this is what we've usually done
in the cases where we have not known the player of a role.

<URL: http://www.ontopia.net/omnigator/models/topic_complete.jsp?tm=3Dtm-st=
andards.xtm&id=3Dassoc-role-player-type >

--=20
Lars Marius Garshol, Ontopian         <URL: http://www.ontopia.net >
ISO SC34/WG3, OASIS GeoLang TC        <URL: http://www.garshol.priv.no >