ID values

Continuing the discussion on ID values: (started here:  http://lists.oasis-open.org/archives/xliff-inline/201108/msg00023.html )  >> I wonder if we should start collecting ideas for this. >> One would be  http://www.w3.org/TR/xml-id/  > > +1 for collecting ideas.  An example of id value:
http://dev.w3.org/html5/spec/Overview.html#the-id-attribute
The only limitation seems to be to not have white-spaces.  -ys