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GML is the same for all applications

You may have noticed that different geospatial applications have developed a variety of different formats (see Is GML a format?) – VPF/VMAP for military data, S-57 for oceanographic and ENC data, numerous national data formats, and formats which depend on the vendor software being used. The point about GML is that all of these format differences go away – if you can read ONE GML file or stream you can read them all. This does not mean that you understand all of the semantics (you may or may not know what to do with a BSpline) – but you will know that it is a GML object and that it is a kind of curve segment. Previous to GML, different readers were written for each and every format, hence different software was often needed for different applicarions just to read the data.

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