Add support for ordered types, mixed content

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+This example shows how to use ordered types to capture and maintain
+element order, including element wildcards.
+
+The example consists of the following files:
+
+transactions.xsd
+  XML Schema which describes various bank transactions. A batch of
+  transactions can contain any number of different transactions in
+  any order but the order of transaction in the batch is significant.
+
+library.xml
+  Sample XML instance document.
+
+transactions.hxx
+transactions.cxx
+  C++ types that represent the given vocabulary as well as a set of
+  parsing and serialization functions. These are generated by XSD
+  from transactions.xsd. Note that the --ordered-type option is
+  used to indicate to the XSD compiler that the batch type is
+  ordered. We also use the --generate-wildcard option to enable
+  wildcard support. An element wildcard is used in the batch to
+  allow transaction extensions.
+
+driver.cxx
+  Driver for the example. It first calls one of the parsing functions
+  that constructs the object model from the input XML file. It then
+  iterates over transactions in the batch using the content order
+  sequence. The driver then performs various modifications of the
+  object model while showing how to maintain the content order.
+  Finally, it saves the modified transaction batch back to XML to
+  verify that the content order is preserved in the output document.
+
+To run the example on the sample XML instance document simply execute:
+
+$ ./driver transactions.xml