Since the macro is procedural, I suppose it's feasible to pass a DTD, XML Schema or Relax NG to typed-html so it would work with any XML. Ideally with checking of ID and IDREF or key/keyref.
The question is then can Rust's macros (or what typed-html's technique is called) encode static/compile-time type checking for regular content models, with SGML-like content exceptions and, to top it, with SGML/HTMLish omitted tag inference?
