[HOT] Date of a mapped feature?

[Pat Tressel]

Nicholas and Andre --

Chris is asking about the date of the *imagery* used for tracing, not the
date of the traced elements.

All --

He makes an excellent point.  If imagery is several years old, then
features being traced may well have changed, with the likelihood being
higher for more ephemeral human-made structures.  For this purpose, would
be nice if imagery sets had metadata that included a creation date, but I'm
looking at the TMS spec, and don't see it, or any field that could be used
for it:
http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification

-- Pat
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