GML stands for Geographical Markup Language. Files with the .gml extension are most commonly associated with the Galdos Systems Open Geospatial Consortium software. This software is used by geographers to store geographical data. The GML files allow the geographical data to be transferred in a standard interchangeable format.
The .gml file extension is also used for Graphlet Graphscript files, Game Maker script files and NetRemote XML-based configuration files.
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If you have additional information about the GML file format or software that uses files with the GML suffix, please do get in touch - we would love hearing from you.