<wiki:CategoryIterator [id='...'] [page='...']> ... </wiki:CategoryIterator>
Iterates over all categories in which the page set by parameter 'page' (or the current page if 'page' is ommitted) is member. The Java variable in which the category name appears can be set by parameter id.
The CategoryIteratorTag is part of the CategoryAndArchiveExtensions.
-- JensGulden