NetworkX 3.0 GraphML Writer: Handling of 'edgedefault' and Node ID Conversion
GraphML Writer/Reader Changes NetworkX 3.0 now writes an explicit edgedefault attribute (directed or undirected) in GraphML files, replacing the prior implicit inference from the graph type. The reader no longer infers directedness when this attribute is missing; it defaults to undirected and issues a warning if directed edges are present. Additionally, node