XML is a W3C recommendation (not an open standard; W3C makes that distinction for a reason). It is based on SGML (not UML). XML is a meta-markup language like SGML; it is a means of specifying markup languages such as HTML or WML (not a markup language like HTML). Being a W3C recommendation, XML is copyrighted... by the W3C (not it cannot be copyrighted). Patenting and licensing of XML schemas or DTDs (which is what Microsoft did) is not the same thing as copyrighting anything (tools, formats used by tools, whatever) As for You can write anything on paper but it still doesn't make it true? I couldn't agree more. In fact that statement is as true of Slashdot comments as it is of paper. Jeez, I hate Microsoft as much as any Slashdotter, but at least get your facts straight!