Namespace declaration in XML at element-level

I generate XML based on an XSD, with the 'Export to XML'-action. The XSD uses elements from another (generic) XSD. This works properly; for these elements a second name space is declared in the XML by this action. However, this declaration turns out te be done at element-level. For every element in the XML based on this generic XSD, the 'Export to XML'-action will create a namespace declaration on the elements line in the XML, even though this declaration is exactly the same for every line/element. This really blows up the size of my XML. It would be nicer if the declaration of this namespace was done only once, at the top level of the XML, so it can be used through out the rest of the XML. Does someone recognize this issue and have a solution for this? Thanks!
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