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+ReadOSM is an open source library to extract valid data from within an
+OpenStreetMap input file. Such OSM files come in two different formats:
+ * files identified by the .osm suffix simply are plain XML files.
+ * files identified by the .osm.pbf suffix does containt the same
+ identical data, but adopting the Google's Protocol Buffer
+ serialization format and thus requiring much less storage space.