Deleting classes

Hi all, I've noticed that if I delete a class document, xwiki does not delete the entry from the xwikiclasses table, nor does it delete the properties asscoiated with that class from the xwikiclassesprop table. Thus when I recreate the class document, all the old properties are still there. Is this intentional or a bug? This all stemmed from me trying to delete a class property (can only do so with direct db modification), so I was hoping that deleting the class doc would be a workaround, but doesn't seem to be - unless I'm missing something ...? I'm still new to xwiki to trying to understand the relationships between entities. Thanks, Matt