This example shows how to handle XML Schema polymorphism features such as
xsi:type attributes and substitution groups in the Embedded C++/Serializer
mapping. The case when xsi:type or substitution groups are used on root
elements is covered in the polyroot examples.

The example consists of the following files:

supermen.xsd
  XML Schema which describes supermen instance documents.

supermen.hxx
  Types that describe the supermen object model in C++. These
  are hand-written.

supermen.map
  Type map. It maps XML Schema types defined in supermen.xsd to
  C++ types defined in supermen.hxx.

supermen-sskel.hxx
supermen-sskel.cxx
  Serializer skeletons generated by XSD/e from supermen.xsd and
  supermen.map.

supermen-simpl-mixin.hxx
supermen-simpl-mixin.cxx

supermen-simpl-tiein.hxx
supermen-simpl-tiein.cxx
  Serializer implementations (using either mixin or tiein parser
  reuse style) that serialize the custom in-memory object model to
  XML. These are hand-written implementations of the serializer
  skeletons defined in supermen-sskel.hxx.

driver.cxx
  Driver for the example. It first constructs a sample object model
  using the types from supermen.hxx. It then creates a serializer
  instance using all the individual serializers found in one of
  supermen-simpl-*.hxx. Finally, it invokes this serializer instance
  to serialize the sample object model to an XML document which is
  printed to STDOUT.

To run the example simply execute:

$ ./driver