I have these main documents which I want to consist of a bunch of 
"subdocuments", which are included/transcluded (own context, so I'll use 
Display, I guess).
Main  |  -> A  |  -> B
This document has two versions, New and Old:     Main_New  |  -> A_new  |  -> 
B_new
Main_Old  |  -> A_old  |  -> B_old
Which is all fine as long as there exists New documents. Now to the finicky 
part.
In some cases, there will be no "new" document for B. I then want this to 
happen:
Main_New  |  -> A_new  |  -> B_old
Main_Old  |  -> A_old  |  -> B_old  So, I want the Main document to include a 
sub-document of it's own type if it exists, and if not, it should pick the 
"older" document. The selection is based on the "main" documents properties.
(Note: I'm having actual new/old documents, so it's not versions of the same 
document. Also, I have simplified my example a bit, the real case has multiple 
levels of inclusion. )    Q: How do I go about creating a good conditional 
inclusion?
                                          
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