I had a look at the online help and it nearly answers my questions.
By default, existing data in a mapped range will be overwritten when you import data. Follow these steps if you want to append new data to the existing data when you import data:
Select a cell in the mapped range.
On the List toolbar, click XML Map Properties.
Click Append new data to existing XML lists and then click OK.
Unfortunately when I do this those options are greyed out!
Is it something I need to do with the source schema?
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