View source for Graph Modelling Language

{{Distinguish|GraphML}}
{{Infobox file format
| name = 
| icon = 
| extension = .gml
| mime = text/vnd.gml
| developer = Michael Himsolt
| type = 
| url = 
}}{{Unsourced|date=April 2024}}
'''Graph Modeling Language''' (GML) is a hierarchical [[ASCII]]-based file format for describing [[Graph (discrete mathematics)|graphs]]. It has been also named ''Graph Meta Language''.

==Example==
A simple graph in GML format:
<pre>
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"
	]
]
</pre>

== Applications supporting GML==
* [[Cytoscape]], an [[Open-source license|open source]] [[List of bioinformatics software|bioinformatics software]] platform for visualizing molecular interaction networks, loads and save previously-constructed interaction networks in GML.
* [[igraph]], an [[Open-source license|open source]] network analysis library with interfaces to multiple programming languages.
* [[Gephi]], an [[Open-source license|open source]] graph visualization and manipulation software.
* [[Graph-tool]], a [[Free software|free]] Python module for manipulation and statistical analysis of graphs.
* [[NetworkX]], an [[Open-source license|open source]] [[Python (programming language)|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_(graph_description_language)|DOT]] file format.
* [[Wolfram Language]], a general very high-level programming language, supports [https://reference.wolfram.com/language/ref/format/Graphlet.html GML import and export].

== See also ==
* [[Graph Query Language]] (GQL)
* [[DGML]]

==References==
{{Reflist}}

==External links==
* [https://web.archive.org/web/20190303094704/http://www.fim.uni-passau.de:80/fileadmin/files/lehrstuhl/brandenburg/projekte/gml/gml-technical-report.pdf GML: A portable Graph File Format], Michael Himsolt - 2010/11/30 ([https://web.archive.org/web/20190303094704/http://www.fim.uni-passau.de:80/fileadmin/files/lehrstuhl/brandenburg/projekte/gml/gml-technical-report.pdf archived version])
* Unravelling Graph-Exchange File Formats, by Matthew Roughan and Jonathan Tuke, 2015, https://arxiv.org/pdf/1503.02781.pdf

{{Graph representations}}

[[Category:Computer file formats]]
[[Category:Graph description languages]]


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