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The OpenStreetMap protocol interface is a REST web service interface prividing read and write operations on the raw map data of the openstreetmap.org database.
The map data is being built from scratch to be released with an open content license. See About OpenStreetMap
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There are no source code libraries or how-to links for OpenStreetMap. If you know one why not add it?
Thanks for the update Harry!
OSM API documentation has moved to here: