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by int_19h 1352 days ago
XSLT (or rather XPath, and even more so XQuery FLWOR) have very expressive ways to walk the tree while filtering/mapping/folding data - much more so than JS over JSON.

XSD is just a way to define schemas for XML documents. I don't know what you mean by "extended XML standard", but islands of one schema within another were not uncommon.