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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.

Example

A simple graph in GML format: 

graph [
	comment "This is a sample graph"
	directed 1
	id n42
	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

  • Apache Tinkerpop, an open source graph computing framework.
  • Clairlib, a suite of open-source Perl modules intended to simplify a number of generic tasks in natural language processing (NLP), information retrieval (IR), and network analysis (NA).
  • Cytoscape, an open source bioinformatics software platform for visualizing molecular interaction networks, loads and save previously-constructed interaction networks in GML.
  • Gephi, an open source graph visualization and manipulation software.
  • Graph-tool, a free and efficient Python module for manipulation and statistical analysis of graphs.
  • igraph, an open source library for the analysis of complex networks, with higher level interfaces for R, Python and Ruby.
  • NetworkX, an open source Python library for studying complex graphs.
  • ocamlgraph, a graph library for OCaml.
  • OGDF, the Open Graph Drawing Framework, an open source C++ library containing implementations of various graph drawing algorithms. The library is self-contained; optionally, additional packages like LP-solvers are required for some implementations.
  • 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.



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