Schema code for a message board
I hate schema code, it makes 0 sense
I have found this list for the thread itself: 

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[schema.org...] 
Never been convinced Schema has value, though others will vociferously disagree. That said, to date never found any problems with non-schema ranking quite nicely ... and can't quite justify helping g out with "more code" that bloats my pages. 
This provides some info, not sure if it applies to your use case but it is a good starting point. 
[developers.google.com...]
You can rank just fine without schema.  

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