Actually, there is a fundamental difference between XML and sexps. In XML, text is unescaped, while the metadata are escaped. In sexps, the metadata are unescap

Actually, there is a fundamental difference between XML and sexps. In XML, text is unescaped, while the metadata are escaped. In sexps, the metadata are unescaped, while the text is escaped. Most text formats fall into one of these two categories. Formats primarily for storing text (like XML or SGML or TeX) are in the former, formats primarily for storing (unstructured) data (like sexps or JSON or YAML) are in the latter.