We use xml asour datasource for xPression and what we have learned is that it is best to remove null or empty xml tags since xPression can only consume a file size of 4MB (not 100% sure that is the right size). Since our xml size can be very large with null or empty xml tags included we had to remove them to allow xPression to consume the file.
We are running xPression 2.5 and using the PublishDocuments webservice call.
