I'm looking at the documentation for `INPUT-FILES` and `OUTPUT-FILES`
and I see this:
```
(defgeneric output-files (operation component)
(:documentation "Methods for this function return two values: a
list of output files
corresponding to this action, and a boolean indicating if they have
already been subjected
to relevant output translations and should not be further translated.
Methods on PERFORM *must* call this function to determine where their
outputs are to be located.
They may rely on the order of the files to discriminate between outputs.
"))
(defgeneric input-files (operation component)
(:documentation "A list of input files corresponding to this
action.
Methods on PERFORM *must* call this function to determine where their
inputs are located.
They may rely on the order of the files to discriminate between inputs.
"))
```
Missing in the above is an explanation of how to tell `INPUT-FILES`
whether to apply output translations or not.
Is this left to the author of the relevant `PERFORM` method? Or is
there something one should do when writing a `PERFORM` method or an
operator definition?
