SOAP Header in WSDL questions

[Dan Ciarniello]

I want to create a service that has a couple of required SOAP header 
elements but I don't want those elements passed as parameters to the 
underlying service methods.  I want to use the header for doing some 
pre-processing before the service method is called.  I want to be able 
to specify the required headers in the WSDL but as far as I can tell, 
there is no way to do this using WSDD.  If header parameters are 
specified in the <operation> sub-element of a <service>, the deployer 
assumes that these are parameters to be passed to the service method.

My approach has been to subclass a BasicHandler, override the 
generateWSDL() method and set the new handler in a <responseFlow>.  The 
handler simply searches out all operation elements in the binding 
element and adds a header element to the input for each operation:

<wsdl:binding ...>
...
<wsdl:operation ...>
  ...
  <wsdl:input ...>
    <wsdlsoap:body 
encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"; namespace="ns" 
use="encoded"/>
    <wsdlsoap:header 
encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"; namespace="ns" 
use="encoded" parts="parm1 parm2"/>
  </wsdl:input>
</wsdl:operation>
</wsdl:binding>

What I would like to know is:
1. Is there any way to do what I want to do using WSDD?
2. If no, is my approach valid?
3. Should I be modifying the WSDL in any other way, in particular to 
specify that the header elements are mandatory?

Thanks,
Dan.
begin:vcard
fn:Dan Ciarniello
n:Ciarniello;Dan
org:CityXpress Corp
adr;dom:;;200 - 1727 West Broadway;Vancouver;BC;V6J 4W5
email;internet:[EMAIL PROTECTED]
title:Software Developer
tel;work:604-638-3800 ext. 322
x-mozilla-html:TRUE
url:http://www.cityxpress.com
version:2.1
end:vcard