As soon as you define your XML namespace used in the XML elements, you can easily import this - no problem.

You need to have your XML look something like this:

<Catalog xmlns:dt="some-xml-namespace-here">
 <Rec>
   <ITEM dt:dt="string"/>
   <QTY dt:dt="string">1</QTY>
   <SUB dt:dt="string">1</SUB>
   <CATALOG dt:dt="string">ABC123</CATALOG>
  </Rec>
  .....
 </Catalog>

After I do this, your two lines of code work like a charm and the data gets imported, no problem (into 5 tables inside the DataSet).

Marc