I'd like to store a graph to a file. Usually I would do that in GraphML. But my nodes have non-scalar properties (e.g. the property "hobby" of node "Alice" has the values ["swimming", "reading"]). As defined in the GraphML specification, properties of nodes may only be scalars, not lists. I looked around and did not find any graph file format that supports lists as properties. Does anybody know such a format?
Cheers,
Manuel