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> S-records, of course, are famous as a general-purpose representation of structure. But .sch is easier to parse AWK-style or scanf-style. Pretty much anything can do that without extra layers of lasagna code.
> 
> In addition, we have structure in another dimension through source= attributes in symbols.

This is a really important point. A line may be part of a: symbol/footprint, net and layer at the same time. There is also a need to handle the objects in different dimensions.