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+This example shows how to use XML Schema polymorphism features such as
+xsi:type attributes and substitution groups in the C++/Tree mapping.
+The example consists of the following files:
+ XML Schema which describes the "supermen" instance documents.
+ Sample XML instance document.
+ C++ types that represent the given vocabulary, a set of parsing
+ functions that convert XML instance documents to a tree-like in-memory
+ object model, and a set of serialization functions that convert the
+ object model back to XML. These are generated by XSD from supermen.xsd.
+ Note also that we use the --generate-polymorphic command line option
+ and that we don't need to use --polymorphic-type to explicitly mark
+ types as polymorphic because this is automatically deduced by the
+ XSD compiler from the substitution groups used in the supermen.xsd
+ schema.
+ Driver for the example. It first calls one of the parsing functions
+ that constructs the object model from the input file. It then prints
+ the content of the object model to STDERR. Finally, the driver serializes
+ the object model back to XML.
+To run the example on the sample XML instance document simply execute:
+$ ./driver instance.xml