John F. Eldredge wrote:
It would make sense to have a separate render, and also to have a way to toggle 
visibility of historical data in the editor.  It would be useful if the state 
of that toggle was saved, on a per-user basis, from one editing session to the 
next.

A separate render is not a problem here as in many cases you want to view for a particular date. The toggle has to be the end_date as adding anything else is pointless. Even if the data we are discussing is 'archived' to another database, a 'current' renderer needs to respect, and ignore data via the end_date flag anyway? Does mapnik currently respect that?

--
Lester Caine - G8HFL
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