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Do you mean anchors as in clickable objects, or do you mean attachments points on nodes for incident edges that stay attached if the node is dragged?

Do you represent the graphviz team? If so, thank you, awesome tool.

I mean attachment points. I didn't need clickable objects in my presentation so I don't know about them.

Yes. Is there a specification for what we need to implement? The native SVG generator is easily modified.