<cas:metadata xmlns:cas="http://oodt.jpl.nasa.gov/1.0/cas">
<keyval type="scalar">
  <key>Filename</key>
  <val>test.txt</val>
</keyval>
<keyval type="scalar">
  <key>ProductType</key>
  <val>GenericFile</val>
</keyval>
</cas:metadata>