Common Lisp is reasonably standardized -- that's the whole point of Common Lisp, though it is hardly dominant. Among general Lisps and Schemes, readers are not

Common Lisp is reasonably standardized -- that's the whole point of Common Lisp, though it is hardly dominant. Among general Lisps and Schemes, readers are not standardized enough to say "kill XML, we'll just have S-Expr" (though I'm not sure what percentage of XML parsers out there follow the XML spec to the letter either).