Registers a class with a multi-mapping. This mapping is specified by the multi-mapping document contained in the given InputSource.
Note: the custom mappings will be registered with the introspector. This must remain so for the reading to work correctly It is recommended that use of the pre-registeration process provided by {@link XMLIntrospector#register} be considered as an alternative to this method.
@see #registerBeanClass(Class) since the general notes given thereapply equally to this
@see XMLIntrospector#register(InputSource) for more details on the multi-mapping format
@since 0.7
@param mapping
InputSource giving the multi-mapping document specifying the mapping
@throws IntrospectionException
@throws SAXException
@throws IOException