If you prefix tag keys of historic elements with "past:", it will not
interfere with extisting SW conserned with rendering the present state.
Examples: "past:building=y", "past:highway=..." At the same time it
should be easy to render historic maps based on existing styles.
I doubt that historical mapping will add significantly to the OSM
database size on the global scale. But if I am wrong, it will certainly
add value to OSM, IMHO.
(I first thought of "historic:" prefix, but that can be misunderstood to
mean present object of historic interest.)
BR/Egil Hjelmeland
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