Condition editor in Interface determination

Hi,

Please help with the Conditions in the Interface determination.

Source message node has 2 attributes: @Name and @Type

Interface should be determined as follows;

If @Name starts-with 'NS' or if @Type = A then SI_Intf1

If @Type = B or if @Type = C and @Name does not start-with 'NS' then SI_Intf2.

Please help with the XPath.

Thanks,

Pratibha