Introduced a new method. This Type Name Definition is used everywhere in this file, very hard to guess the meaning in others places. This method should centralize the definition in one place. This file will be be updated to use this method instead local definition everywhere.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32250 20353a03-c40f-0410-a6d1-a30d3c3de9de