Graph Modelling Language

Filename extension| `.gml`

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Internet media type| `text/vnd.gml`
Developed by| Michael Himsolt

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

## Contents

* 1 Example
* 2 Applications supporting GML
* 3 See also
* 4 References
* 5 External links

## 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.
* Social Network Visualizer (SocNetV), a free software application for social network analysis and visualization. SocNetV can load GML formatted text files.[1]
* Tulip 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.

## See also

* Graph Query Language (GQL)
* Json Graph https://github.com/jsongraph/json-graph-specification
* Unravelling Graph-Exchange File Formats, by Matthew Roughan and Jonathan Tuke, 2015, https://arxiv.org/pdf/1503.02781.pdf

## References

1. ↑ "GML format in SocNetV". https://socnetv.org/docs/formats.html#GML.

## External links

* GML: A portable Graph File Format, Michael Himsolt - 2010/11/30 (archived version)

* v
* t
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Graph representations

Data structures|

* Graph (abstract data type)
* Adjacency list
* Edge list
* Adjacency matrix
* Incidence matrix

XML-based formats|

* DGML
* DotML
* GEXF
* GraphML
* GXL
* XGMML

Text-based formats|

* DOT
* Graph Modelling Language (GML)
* LCF notation for cubic Hamiltonian graphs
* Newick format for trees
* Trivial Graph Format

Related concepts|

* Graph database
* Graph drawing
* Linked data

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