document: XML-based XML schema access XML Schema 's abstract data model consists of components , which are the structures that eventually define a schema as a whole . XML Schema 's XML syntax , on the other hand , is not a direct representation of the schema components , and it proves to be surprisingly hard to derive a schema 's components from the XML syntax . The Schema Component XML Syntax ( SCX ) is a representation which attempts to map schema components as faithfully as possible to XML structures . SCX serves as the starting point for applications which need access to schema components and want to do so using standardized and widely available XML technologies .
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