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 ...
SGML (standard generalized markup language) is a standard for how to specify a document markup language or tag set. Such a specification is itself a document type definition (DTD). SGML is not in ...
Have you ever played the “spot the development platform” game? In my version of it, points are awarded to players who correctly guess what programming language an application is written in, simply by ...
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