V03 issue617 (part of it.) "topic" depends more on payload format, than message protocol. #685
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move topic generation away from message protocols and into the payload format code.
the WIS format has a different scheme for determining topic hierarchy, so need a way for the postformat/wis.py to return the "topic" for published messages.
I think the universal idea is that one should be able to determina an appropriate topic from the content of the message.