> We had that a decade ago. It was called XML and XML Schema. It would be true if XML was not full of all this SGML debris like "entities" (really, uncontrolle

> We had that a decade ago. It was called XML and XML Schema. It would be true if XML was not full of all this SGML debris like "entities" (really, uncontroller macros), if real schema formats was flexible enough (I needed <c> inside <a> and <c> inside <b> when they totally different), etc. But when a config reader tool has to deal with 40+-year legacy of enterprise guys wanting to embrace the universe, but all this doesn't allow to control contents without external measures like regexp checking... that simply shuts up facing real world.