TODO:

Version 0.1 (Done)
    - proof of concept

Version 0.2
    - Simple mapping
    - ZSQL Methods generated automatically

Version 0.3
    - Relational mapping

Version 0.4
    - Virtual metadata through joins

Version 0.5 (or sooner)
    - LDAP methods in addition to SQL methods
        - use of Zope LDAP
        - extension of Zope LDAP to add support for edit LDAP methods
          in addition to query methods

Version 1.0
    - Release