Well formed and validated, two distinct concepts. Although it is sometimes deemed a negative, having attributes as well as nodes can offer subtleties that are u

Well formed and validated, two distinct concepts. Although it is sometimes deemed a negative, having attributes as well as nodes can offer subtleties that are unmatched in other data exchange formats. While I appreciate the usefulness of JSON, XML and its siblings XPath, XSLT, etc. have their own strengths but taking advantage of them is requires thinking differently.