In the writing of an article, i think we should focus on the 30040/41 pair. Keeps it simple, the idea being 30040/41 is about as basic an object you can create for 'knowledge'. Blogs, docs, etc. can always be broken down into grouped 30041. 

In the case for composing collages or grouping related ideas from different events, that's when we can think about what the process will be. 

 Okay, so hard-code everything to 30040/41 for the alpha release? 

 That would be easier to implement. 

 What about also allowing 30041 alone?

I guess that already forces you to have a structure selection interface. 

 Yeah that's an option.  I'll have to really knuckle down and figure out how to design/build the UI to make that possible.  Flexibility is hard to code.