imported>LR.127: Adding short description: "File format for graphs"

2024-12-23T22:56:03Z

Adding short description: "File format for graphs"

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{{Short description|File format for graphs}}
{{Distinguish|Graph Modelling Language}}
{{Infobox file format
| name = GraphML
| icon =
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|_noextcode =
| extension = 
|_nomimecode =
| mime =
| type code =
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| magic =
| developer = [http://graphdrawing.org/ Graph Drawing]
| released = 
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| latest_release_date = 
| genre = [[Graph description language]]
| container_for =
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| url = {{URL|http://graphml.graphdrawing.org/}}
}}

'''GraphML''' is an [[XML]]-based file format for [[Graph (discrete mathematics)|graphs]]. The GraphML file format results from the joint effort of the [[graph drawing]] community to define a common format for exchanging graph structure data. It uses an XML-based syntax and supports the entire range of possible graph structure constellations including directed, undirected, [[mixed graph]]s, [[hypergraph]]s, and application-specific attributes.<ref>{{Cite book|contribution=Graph Markup Language (GraphML)|first1=Ulrik|last1=Brandes|author1-link=Ulrik Brandes|first2=Markus|last2=Eiglsperger|first3=Jürgen|last3=Lerner|first4=Christian|last4=Pich|url=http://cs.brown.edu/people/rtamassi/gdhandbook/chapters/graphml.pdf|pages=517–541|editor-first=Roberto|editor-last=Tamassia|editor-link=Roberto Tamassia|title=Handbook of Graph Drawing and Visualization|publisher=CRC Press}}.</ref>

==Overview==
A GraphML file consists of an XML file containing a <code>graph</code> element, within which is an unordered sequence of <code>node</code> and <code>edge</code> elements. Each <code>node</code> element should have a distinct <code>id</code> attribute, and each <code>edge</code> element has <code>source</code> and <code>target</code> attributes that identify the endpoints of an edge by having the same value as the <code>id</code> attributes of those endpoints.
Here is what a simple undirected graph with two nodes and one edge between them looks like:
<syntaxhighlight lang="xml">
<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
<graph id="G" edgedefault="undirected">
<node id="n0"/>
<node id="n1"/>
<edge id="e1" source="n0" target="n1"/>
</graph>
</graphml>
</syntaxhighlight>

Additional features of the GraphML language allow its users to specify whether edges are directed or undirected, and to associate additional data with vertices or edges.

==See also==
*[[yEd]], a widespread graph editor that uses GraphML as its native file format (but ports, hypergraphs not supported and limited nested graphs support).
*[[Gephi]], a graph visualization software that supports a limited set of GraphML.
*[[DOT (graph description language)]]
*[[Boost (C++ libraries)|Boost libraries]] allow to read from and write to GraphML format.

==References==
{{reflist}}

==External links==
*{{Official}}
*[http://graphml.graphdrawing.org/primer/graphml-primer.html GraphML Primer]
*[https://web.archive.org/web/20190814062720/http://www.svgopen.org/2003/papers/ComparisonXML2SVGTransformationMechanisms/ Comparison between XML to SVG Transformation Mechanisms], showing conversions between GraphML and [[Scalable Vector Graphics|SVG]]

{{Graph representations}}
[[Category:XML markup languages]]
[[Category:Graph description languages]]
[[Category:XML-based_standards]]

GraphML - Revision history

imported>LR.127: Adding short description: "File format for graphs"