GEXF (Graph Exchange XML Format) is an XML-based file format for storing a single undirected or directed graph.

The GraphTheory[ImportGraph] and GraphTheory[ExportGraph] commands can read from and write to this format.

The general-purpose commands Import and Export also support this format.

$\mathrm{Petersen}≔\mathrm{Import}\left(''example/petersen.gexf''\,\mathrm{base}=\mathrm{datadir}\right)$

$\mathrm{Petersen}≔\mathrm{Graph\; 1:\; an\; undirected\; unweighted\; graph\; with\; 10\; vertices\; and\; 15\; edge(s)}$

$\mathrm{GraphTheory}:-\mathrm{DrawGraph}\left(\mathrm{Petersen}\right)$

$\mathrm{KG}≔\mathrm{GraphTheory}:-\mathrm{SpecialGraphs}:-\mathrm{KneserGraph}\left(3\,2\right)$

$\mathrm{KG}≔\mathrm{Graph\; 2:\; an\; undirected\; unweighted\; graph\; with\; 3\; vertices\; and\; 0\; edge(s)}$

$\mathrm{Export}\left(''kneser.gexf''\,\mathrm{KG}\,\mathrm{base}=\mathrm{homedir}\right)$

$524$

GEXF Format, www.gexf.net