xml-to-es was originally written to translate [David Lewis's Reuters collection in SGML](http://www.daviddlewis.com/resources/testcollections/reuters21578 ...
Abstract: Succession in standardization is usually a problem. The advantages of improvements are weighed against those of compatibility. If compatibility considerations dominate, a grafting process ...
While a well-formed document is well-formed because it follows rules defined by the XML spec, a valid document is valid because it matches its document type definition (DTD). The DTD is the grammar ...