<Dataset
   name="test_fill.nc"
   dapVersion="4.0"
   dmrVersion="1.0"
   xmlns="http://xml.opendap.org/ns/DAP/4.0#"
   xmlns:dap="http://xml.opendap.org/ns/DAP/4.0#">
  <Variables>
    <UInt8 name="uv8"/>
    <Int16 name="v16"/>
    <UInt32 name="uv32">
      <Attribute name="_FillValue" type="UInt32">
        <Value value="17"/>
      </Attribute>
    </UInt32>
  </Variables>
  <Attribute name="_DAP4_Little_Endian" type="UInt8">
    <Value value="1"/>
  </Attribute>
</Dataset>