As of Berkeley DB XML 2.3, the Python API supports
a number of exceptions, all derived from XmlException.
See examples/python/examples.py and examples/python/basic/*.py
for examples of usage.

The exception classes map to the XmlException::ExceptionCode
enumeration in the C++ API.  The all derive from Python's Exception
class, and include:
	XmlException (parent class for all)
	XmlContainerClosed
	XmlContainerExists
	XmlContainerOpen
	XmlDatabaseError
	XmlDocumentNotFound
	XmlInvalidValue
	XmlParserError
	XmlInternalError
	XmlVersionMismatch
	XmlLazyEvaluation
	XmlUnknownIndex
	XmlQueryEvaluationError
	XmlQueryParserError
	XmlEventError
	XmlContainerNotFound
	XmlUniqueError
	XmlNoMemoryError
	XmlNullPointer
	XmlTransactionError
	XmlOperationInterrupted
	XmlOperationTimeout

They have the following properties that may be printed:
     what (corresponds to XmlException::what() in the C++ API)
     exceptionCode (corresponds to XmlException::ExceptionCode
          in the C++ API)
     dbError (valid if class is XmlDatabaseError)

These next two are valid if class is XmlQueryParserError or
XmlQueryEvaluationError, and indicate the location in the
query expression that generated the exception:
     queryLine
     queryColumn