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DGML (Directed Graph Markup Language) is an XML-based file format for storing a directed graph, typically representing program dependencies. It was developed by Microsoft.

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.

$G≔\mathrm{Import}\left(''example/project.dgml''\,\mathrm{base}=\mathrm{datadir}\right)$

$G≔\mathrm{Graph\; 1:\; a\; directed\; graph\; with\; 4\; vertices\; and\; 3\; arcs}$

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

$\mathrm{HG}≔\mathrm{GraphTheory}:-\mathrm{SpecialGraphs}:-\mathrm{HeawoodGraph}\left(\right)$

$\mathrm{HG}≔\mathrm{Graph\; 2:\; an\; undirected\; graph\; with\; 14\; vertices\; and\; 21\; edges}$

$\mathrm{Export}\left(''heawood.dgml''\,\mathrm{HG}\,\mathrm{base}=\mathrm{homedir}\right)$

$1414$

DGML Schema , microsoft.com