Well, as I have browsed through here and there on the same topic –
I found that, when we are doing some kinda schema validation – be it in TN or Developer, as long the content within the root tags conforms to the schema – it will validate the particular incoming data irrespective of the fact that the XML data has got something more after the end of the root tag.
While validation,the wM service will consider the rest data as other nodes n will validate successfully.
But if you put an invalid XML after the end of the root tag – it will give u error as the rest part of the data is not a valid XML.