Hi JDruhanC, see: http://wiki.openstreetmap.org/wiki/Proposed_features/Date_namespace.
For example: highway=track highway:1900--1950-07=path highway:1950-07--1985=track start_date=1900 end_date=1985 It gets complicated (according to rendering a certain date) when the dates of "path" and "track" overlap due to unknowingness etc. - how do we render that? But in general I think this is a legit method.
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