Gets the type of the object corresponding to the supplied XmlElement.
The Type of the class that is being defined via parsing the supplied Element.
Note that, for application classes, it is generally preferable to override
GetObjectTypeNameinstad, in order to avoid a direct dependence on the object implementation class. The ObjectDefinitionParser and its IXmlObjectDefinitionParser (namespace parser) can be used within an IDE add-in then, even if the application classses are not available in the add-ins AppDomain.