[uf-discuss] hReview "type" question

[Nora Brown]

I know this is partially addressed in the first hReview FAQ on the
microformats wiki, but I have a more general question. I have been
reading a lot about microformats, and have used hCard, but am fairly
new to them overall.
The possible values of 'type' are limited to: product | business |
event | person | place | website | url. Why? It seems quite strange
and indirect, even undesirable, to me to add a link to the Wikipedia
"definition" of a book (as a tag, suggested in the FAQ) to my academic
book review as a way of simply saying "I am reviewing a book". So my
question is, why do the types have to be limited to this list? And, if
there is a good technical reason why they should be, why not allow a
sub-type, that is open to any value? As it is, the extremely general
nature of the types available make them much less useful. No one is
ever looking for a review of any old "business" in Santa Cruz, CA,
they are looking for a restaurant or movie theater. Any information on
this topic is really appreciated.