Graph Modelling Language
# Graph Modelling Language

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

## Example

A simple graph in GML format:

## 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.
* Social Network Visualizer (SocNetV), a free software application for social network analysis and visualization. SocNetV can load GML formatted text files.
* 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.
* The Graph Template Library, a C++ library for graphs and algorithms, uses GML for import and export.
* A sample GML-parser written in C released under the LGPL.
