[Tagging] "dispute" about how to tag a type=multipolygon relation

[Anthony]

On Thu, Jun 7, 2012 at 12:44 PM, Tobias Knerr <osm at tobias-knerr.de> wrote:
> My opinion here is that multipolygon relations should not be used
> unnecessarily. So if a closed way is possible (no holes, "small" area),
> then it should be used instead of a multipolygon.

What if different parts of the way have different tags?  Does that
render a closed way "not possible"?