> when I try to specify an empty set in the data file I cannot make it
> work, though it is working in the above version:
>
> set S := {}; /* In the data file */
>
> obtaining: syntax error in set data block
>
> the other way round does not work either, i.e., defining an empty set in
> the model and trying to override this in the data file.
>
> Whatever suggestion is appreciated.
>
You can declare the set as follows:
set S, default {};
In this case, if no value is given for S in the data section, the
default value (an empty set) will be used. For more details please see
the language reference.
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