User:RailML Coord Documentation/Spielwiese
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The full urn reference part of the attributes epsgCode and heightEpsgCode - that is "urn:ogc:def:crs:EPSG::" - is treated to be constant. (Between the last two colons :: is the place for a version number of the EPSG code if there would be any.) Since it is clear that the attributes are only allowed to contain EPSG numbers, and if there would be no version number, you can omit the constant part, just reducing the value to the actual EPSG code number: epsgCode="urn:ogc:def:crs:EPSG::4326" is the same as epsgCode="4326".
epsgCode="urn:ogc:def:crs:EPSG::4326"