[TYPO3-dev] Add Model to Extension by External Extension

[Bernd Schönbach]

Hi,

is there a way to add a model to extension_1 by installing extension_2 
and not having to modify extension_1?

Example:
I create a blog extension which is great with creating blog entries.

Now I want to attach authors to my blog entries, without touching the 
blog extension since I don't need authors in all of my websites.
Is there a way to do this?

As far as I understood I would still need an author model within the 
blog extension, although I can map the new model with the persistence 
setup in the typoscript. Is that correct or does another way exist to 
add this model and the relation?

Thanks
Bernd