Custom FaultCode (what is the spec saying?)

[Dan Diephouse]

I am looking at how to communicate fault information from my service to 
clients.  I am unclear about the faultCode element and it's potential 
uses.  The spec says:

The faultcode values defined in this section MUST be used in the 
faultcode element when describing faults defined by this specification. 
The namespace identifier for these faultcode values is 
"http://schemas.xmlsoap.org/soap/envelope/";. Use of this space is 
recommended (but not required) in the specification of methods defined 
outside of the present specification.

Does this mean I can definte my own custom faultcodes?  i.e. ones that 
aren't Server or User or VersionMismatch... For example, NoSuchStock for 
the stock lookup example.

And, if I can definte my own faultcodes, is that recommended?  Or would 
I be much better off using the <detail> element.

Thanks,

Dan Diephouse
http://envoisolutions.com/people/dan