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IIRC a key point of d3 was to not be declarative, like the gog. That was more an influence in protoviz, its precursor.

You might be interested in Vega and Vega lite if you want to go declarative.

I'm contributing to plotly.js right now, which is also declarative, and I see the pros and cons of levels of denotative semantics (mostly depends on goals and library user requirements) but it was just an example for what I mean by more radical changes. Good you mentioned it anyway, protovis -> D3 also represented a rather disruptive change. But perhaps I was late with these questions for this specific AMA.

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