Using a clip mask in CLX

Can anyone explain to me how you enter a clip-mask rectangle definition 
in CLX.?   I understand the concept of the clip mask.   What I don't 
understand is how you describe the clip mask.

The code looks something like
                            (setf (xlib:gcontext-clip-mask gc) ????)

What should go where ???? is.   Everything I try seems to give me a 
runtime error.

Is there ANYWHERE where examples of this sort of thing are hidden?   The 
CLX manual is too basic for real use.


Thanks in advance,

Bill

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