Common standards for visual data representation

I’ve been looking for common standards for representing data in RDF, JSON etc ready for visualisation (eg for graphs, trees, charts etc), but without much luck.

I’m surprised how little there appears to be to find in this area. Let me know if you know of anything relevant.

My search for visualisation data standards has so far found few docs:

Vega is promising: documented JSON formats for a wide range of visualisations, and with a JSON schema for validation and transformation. So fingers crossed Vega will be fairly easy to transform for use by other systems such as d3.

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