support insert gexf/graphml/gml

[cmdares]

• [ X] I agree to follow the Code of Conduct that this project adheres to.
• [ X] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe. support insert or import gexf/graphml/gml fragment The above three formats are the current information formats of dynamic graph visualization, which are much better than CSV I hope future versions can be enhanced.

Describe the solution you'd like toolbar menu: insert -> advanced -> gexf(graphml/gml)... paste xml fragment ref gefx-js project: https://github.com/raphv/gexf-js https://github.com/anvaka/ngraph.gexf

Describe alternatives you've considered

Additional context

[davidjgraph]

What's the ETA on this?

[stale[bot]]

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