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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.

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Example

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"
]
]

Applications supporting GML

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.

See also

DGML

References

cite-ref-1[1]

cite-note-11. Plenz, M., Frank, A., Graph Language Models, 2401.07105, cs.CL, 2024, https://arxiv.org/abs/2401.07105, access date: 2025-07-03

External links

• 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