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 Family Tree of Schema Languages for Markup Languages
Link to this resource A diagram showing the historical relationships between the various schema languages developed in the last 15 years for controlling data in SGML and XML.  | An indispensible guide to various data constraint mechanisms.Taking the form of a timeline plotted against underlying abstraction (inheritance, grammar and patterns) it is very useful for helping to tell DCD from XML-Data from XML Schema. The author is a member of the XML Schema Working Group. |  |
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