[Zope-CMF] Scriptable Type - Meta Type question

[Jeffrey Franks]

Hi,

I've customized 'File' as a scriptable type 'MyFile' that has some
additional attributes. Both content types will be made available,
but for widely differing purposes.

The original meta type is 'Portal File'. Should I change this
to some new meta type for the 'MyFile' portal_type?

The original portal_type 'File' has a meta type of 'Portal File'.
Why the difference?

What are the implications and usage difference of portal_type
and meta type?

-- jlf