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>> I also think that we need a language agnostic markup language to represent the BREP.

I agree with that, but some serious decisions have to be made or it will end up a mess like STEP.

Yeah, agreed. Would be cool to have multiple CAD kernels using the same markup language, then you can easily version control and use it for interchange.

In what way do you consider STEP to be a mess?

ISO 10303-21 is annoying to read and write, with an awful lot of stuff not used by CAD tools

Don't read or write it then, use software that will do it for you.

I don't know of anything that isn't useful in ISO 10303-21.

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