I was referring to this: > Each single graphical element had 2 or 3 different XML "source" files, distributed in different subdirectories S-expressions with e

I was referring to this: > Each single graphical element had 2 or 3 different XML "source" files, distributed in different subdirectories S-expressions with equivalent content are smaller and just as readable, and don't need an extra parser. XML is OK for text mark-up, but not as good for storing data (including programs).