GXL (Graph eXchange Language) 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.

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

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

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

GXL Specification, www.gupro.de

Holt R.C., Winter A., A Short Introduction to the GXL Exchange Format, Proceedings 7th Working Conference on Reverse Engineering (WCRE 2000).