(except PropertyTypeValidity, as it is implicitly defined for all Document
Types).

Currently, it is only tested in PropertyExistence test (but the logic is the
same in each constraint).


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@10316 20353a03-c40f-0410-a6d1-a30d3c3de9de