GraphML (.graphml) Graph Format
GraphML file format
GraphML 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.
Import a GraphML file encoding the Petersen graph.
Petersen≔Graph 1: an undirected unweighted graph with 10 vertices and 15 edge(s)
Export the Clebsch graph to a GraphML file in the home directory of the current user.
CG≔Graph 2: an undirected unweighted graph with 16 vertices and 40 edge(s)
GraphML Specification, graphdrawing.org.
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