A gml file extension is related to the Graphlet Graphscript, an extensible programming language for writing graph algorithms.
GML file extension - Graphlet Graphscript data file
What is gml file? How to open gml files?
File type specification:
The gml file extension is associated with Graphlet Graphscript, a Tcl/Tk based, extensible programming language for graph algorithms with user interfaces.
Graphscript is implemented in C++ and GTL, an STL based library for programming with graphs.
A scriptable, customizable graph editor, implemented in Graphscript. Graph drawing algorithms, implemented in C++/GTL and Graphscript.
Portable, extensible design running on several platforms.
Both Graphlet and Graphscript are no longer actively developed or supported.
This gml file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.