Free TREX Basics Tutorial

In this article, we’ll explore the TREX markup languagefor validating XML documents, focusing on validating a subset of XMLNews-Story MarkupLanguage. Although the XMLNews-Story markup language has beensuperseded by the News Industry TextFormat, we use the old version because it’s simple, it looks agreat deal like HTML, and it lets us easily show some of TREX’sfeatures.TREX’s author, James Clark, says,”A TREX pattern specifies a pattern for the structure and content of an XML document. A TREX pa 
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