To sign a SOAP header element, select the QName radio button
and provide the namespace and optionally the localname of the
SOAP header element to sign. If the localname is omitted, all SOAP
header elements with the specified namespace are signed. Note that
in order to use the QName selection method, the SOAP header elements
must be the immediate children of the SOAP header. You cannot select header
elements that are sub-elements of other elements in the SOAP header using QName.
In this case, you must use an XPath expression to select these header
elements.