Add parentTypeId to ContentPurposeType?

[Al Byers <by...@automationgroups.com>]

I see a need to make content management more "Joomla" like and Joomla has
the concept of Section and Category for attributing content. The Section
would correspond to the existing ContentAssoc.mapKey and Category would be
modeled by ContentPurpose/Type.

The problem (and it is a minor one) is that there will be times that you
would like to present the "app-specific" categories (ContentPurposeTypes) to
a user without including all the seed types and it probably would not be
desirable to get rid of the seed ContentPurposeTypes.

It seems like adding a "parentTypeId" to ContentPurposeType would not break
anything and it would be easy to select just the app-specific types.

Thoughts?

-Al