This example shows how to use the C++/Tree mapping to parse several
XML documents while reusing the underlying XML parser and caching the
schemas used for validation.

The example consists of the following files:

library.xsd
  XML Schema which describes a library of books.

library.xml
  Sample XML instance document.

library.hxx
library.cxx
  C++ types that represent the given vocabulary and a set of parsing
  functions that convert XML instance documents to a tree-like in-memory
  object model.

  These files are generated by the XSD compiler from library.xsd using
  the following command line:

  xsd cxx-tree library.xsd

driver.cxx
  Driver for the example. It first sets up the Xerces-C++ DOM parser
  and caches the library.xsd schema for validation. It then performs
  ten iterations that parse the input file to a DOM document using
  the DOM parser and call one of the parsing functions that constructs
  the object model from this DOM document. On each iteration the driver
  prints a number of books in the object model to STDERR.

To compile and link the example manually from the command line we can use
the following commands (replace 'c++' with your C++ compiler name):

c++ -DXSD_CXX11 -c library.cxx
c++ -DXSD_CXX11 -c driver.cxx
c++ -o driver driver.o library.o -lxerces-c

Note that we need to define the XSD_CXX11 preprocessor macro since the
source code includes libxsd headers directly.

To run the example on the sample XML instance document execute:

./driver library.xml library.xsd