This example shows how to handle XML vocabularies with multiple root elements using the C++/Tree mapping. See also the messaging example for an alternative approach that uses the element type and element map features of the C++/Tree mapping. The example consists of the following files: protocol.xsd XML Schema which defines a simple bank account protocol with requests such as withdraw and deposit. balance.xml withdraw.xml deposit.xml Sample XML instances for the protocol requests. protocol.hxx protocol.cxx C++ types that represent the given vocabulary and a set of parsing functions that convert XML documents to a tree-like in-memory object model. These are generated by XSD from protocol.xsd. dom-parse.hxx dom-parse.cxx Definition and implementation of the parse() function that parses an XML document to a DOM document. driver.cxx Driver for the example. It first calls the above parse() function to parse the input file to a DOM document. It then determines the type of request being handled and calls the corresponding parsing function that constructs the object model from this DOM document. Finally, it prints the content of this object model to STDERR. This example intentionally does not support the deposit request to show how to handle unknown documents. To run the example on the sample XML request documents simply execute: $ ./driver balance.xml $ ./driver withdraw.xml $ ./driver deposit.xml