There seems to be an error in one of the 0.5 API DTD's. The full-DTD-page says that a relation may have 0 or more tags or members, while the actual DTD on http://dev.openstreetmap.org/~kleptog/osm-0.5.dtd says that there should be at least one tag or member. I suppose that the former option is true if I read through other explanations.

So, if someone can confirm this, this can be cleaned up before version 0.6 maybe :).

Kind regards,

Michel