OWL-S: question about input binding

Hi,

I would like to bind an external value to an input parameter. By an 
external value, I mean a value that is not bound to the parameters 
defined in my process model but comes from the execution context, e.g. 
the login name of the user who has logged on our portal and is using 
different provided services. My process control engine maintains the 
execution context under which it executes the processes. The execution 
is controlled using the process model. Now, if a process needs this 
login name, it must specify an input binding with a URI referring to 
this item, e.g. &myont;#loginName. Would it be conform with the 
semantics of 'valueForm' to do the specification in OWL-S the following way:

	<owls:valueForm>
	  <myont:ContextBinding>
	    <myont:valueOf rdf:resource="&myont;#loginName"/>
	  </myont:ContextBinding>
	</owls:valueForm>

Thanks in advance for any comments,

-- Saied