Hi, Following this discussion here is a proposed clarification to Key:source <http://wiki.openstreetmap.org/wiki/Key:source>. The goal is to define the word, make date mandatory, use ISO format, define per source tag meaning. Is there any objection or suggestion for changes?
*survey* yyyy-mm[-dd] (with one blank and an /ISO/ 8601 <http://www.google.be/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&sqi=2&ved=0CDAQFjAC&url=http%3A%2F%2Fwww.iso.org%2Fiso%2Ffr%2Fhome%2Fstandards%2Fiso8601.htm&ei=X3qZU_CEPNHR4QT34YGwCg&usg=AFQjCNHMm5_cA8CzTjEvrWYQc5GZ9K1wLg&sig2=m6xdSXuaBGqt6Qlj0tCfTw&bvm=bv.68911936,d.bGE> format date) can be used within the data of any source.KEY=* or source=* tag to indicate that, on that date, the source(s) of KEY were the most recent and the data was verified to be correct for that KEY. In source=*, survey means the same for all possible (required) keys (even those absent by default), but it can be overridden by survey in some source.KEY tags. survey helps to avoid making already done verifications, especially because a source publication date is not a verification date. survey can contain the date of dateless sources like visual or knowledge. It can help humanly assisted bulk imports. Please update the survey date of what you verify (a substantial time later), even if you don't add survey dates yourself. Suppose an *.osm file is built from an imported source. The map contributors are requested to move/update the map elements to osm.org after verifications such as coordinates. If the *.osm map elements contain a survey value such as source=survey <import-date>, then a program can find out by checking for an equal or later survey date what map elements have been moved/updated to osm.org and hence build a remaining.osm file containing what remains to be done. A FIXME can be added at import time to already existing osm.org elements to warn about the ongoing import. Cheers, André.
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