How to understand gegl formula?

What does the ABCabc… In the formula mean?
Where can I find the relevant explanation documents.
thank you.
截图 2022-12-01 12-18-35

This is more or less literally coming from the SVG spec: Scalable Vector Graphics (SVG) Compositing Specification - it has a description of the variables on top (slightly different naming, though)

Thank you very much . :+1: :+1:

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