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Computed values in a macro

Is it possible to insert computed values into a macro?
 For example, say I want to turn

  (sexp this that)

into

  (xexpr "this" "that")

The only way I can see to do this is to go

  (sexp this that)

=>
  `(xexpr ,(symbol->string this) ,(symbol->string
that))

and then

  (eval `(xexpr ...))

This is a pain as I have to manually include
(un)quotes into my macros.  Is there a more elegant
way?

TIA
Noel


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