LEDA is a text-based file format for storing a single directed or undirected graph.

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

$\mathrm{digraph}≔\mathrm{Import}\left(''example/digraph.lgr''\,\mathrm{base}=\mathrm{datadir}\right)$

$\mathrm{digraph}≔\mathrm{Graph\; 1:\; a\; directed\; unweighted\; graph\; with\; 11\; vertices\; and\; 12\; arc(s)}$

$\mathrm{GraphTheory}:-\mathrm{DrawGraph}\left(\mathrm{digraph}\,\mathrm{style}=\mathrm{spring}\right)$