How to understand gegl formula？

Applications
1

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
http://www.getfr.org/pub/dragonfly-release/usr-local-share/doc/gegl/operations.html#op_svg:dst-atop

2

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)

3

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

4

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