Url and Page classes used to encapsulate the "site map" information (URL
regular expressions, Django views, menu item names, etc.) and the relation
between pages in the site map.
There are still lots of TODOs in this first pass.
Patch by: Todd Larsen
Review by: to-be-reviewed
from django.db.backends.dummy.base import complain
get_table_list = complain
get_table_description = complain
get_relations = complain
get_indexes = complain
DATA_TYPES_REVERSE = {}