This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 12]

zen::XmlDoc	The complete XML document
zen::XmlElement	An XML element
zen::XmlError	Exception base class for zen::Xml
zen::XmlFileError	Exception thrown due to failed file I/O
zen::XmlParsingError	Exception thrown due to an XML parsing error
zen::XmlIn	Proxy class to conveniently convert XML structure to user data
zen::XmlOut	Proxy class to conveniently convert user data into XML structure