Graph Modelling Language

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Graph Modeling Language (GML) is a hierarchical ASCII-based file format for describing graphs. It has been also named Graph Meta Language.

A simple graph in GML format:

graph [ 	comment "This is a sample graph" 	directed 1 	id 42 	label "Hello, I am a graph" 	node [ 		id 1 		label "node 1" 		thisIsASampleAttribute 42 	] 	node [ 		id 2 		label "node 2" 		thisIsASampleAttribute 43 	] 	node [ 		id 3 		label "node 3" 		thisIsASampleAttribute 44 	] 	edge [ 		source 1 		target 2 		label "Edge from node 1 to node 2" 	] 	edge [ 		source 2 		target 3 		label "Edge from node 2 to node 3" 	] 	edge [ 		source 3 		target 1 		label "Edge from node 3 to node 1" 	] ] 

• Cytoscape, an open source bioinformatics software platform for visualizing molecular interaction networks, loads and save previously-constructed interaction networks in GML.
• igraph, an open source network analysis library with interfaces to multiple programming languages.
• Gephi, an open source graph visualization and manipulation software.
• Graph-tool, a free Python module for manipulation and statistical analysis of graphs.
• NetworkX, an open source Python library for studying complex graphs.
• Tulip (software) is a free software in the domain of information visualisation capable of manipulating huge graphs (with more than 1.000.000 elements).
• yEd, a free Java-based graph editor, supports import from and export to GML.
• The Graphviz project includes two command-line tools (gml2gv and gv2gml) that can convert to and from the DOT file format.
• Wolfram Language, a general very high-level programming language, supports GML import and export.

• Graph Query Language (GQL)

• GML: A portable Graph File Format, Michael Himsolt - 2010/11/30 (archived version)
• Unravelling Graph-Exchange File Formats, by Matthew Roughan and Jonathan Tuke, 2015, https://arxiv.org/pdf/1503.02781.pdf

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