BUG: Use more than one RDF value as input parameter for my user defined functionF about morph-kgc HOT 4 CLOSED

Maybe this corner case is a limitation of RML-FNML, since the current specification does not consider it. I am not sure if what you are trying to achieve is feasible, but function execution is handled here and probably the parser would need to be modified aswell.

In the workaround that I mentioned, you could provide your list in Python style as input, for instance [1, 2] or ['one', 'two'] and cast the list at the beginning of the function input_parm = list(input_parm).

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Hi @KappaGi ,

I am not sure if I understood well since you are missing a complete example with the full mapping, data and udf. I think what you are trying to do is not possible. You could maybe try:

<#Execution>
    fnml:function ex:myFunction;
    fnml:input
    [
      fnml:parameter grel:param;
      fnml:valueMap [
        rml:reference "column_1";
      ]
    ];
    fnml:input
    [
      fnml:parameter grel:myParameter;
      fnml:value "ex:value_1 ex:value_2";
    ];
.

And manage the multiple values of the parameter within the udf. This is, you can provide the multiple parameters as a character-separated literal (e.g., comma or a whitespace), that in the udf (by splitting...).

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Hello @arenas-guerrero-julian,

Thank you for your answer. I want to have several fnml:values for grel:myParameter in my mappings so that in my udf in python I can manage those values as a python list. It works if I use a single rdf resource or a single rdf literal as fnml:value, but It seems that I can't use several rdf resources (nor literals) in the mappings for this purpose.

So the only current solution to have a list of values for a single parameter in python udf is to provide several values in a single literal (i.e. using a delimeter) in the mappings and do the required post-processing in the udf.

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@arenas-guerrero-julian

Would it be possible to modify the way udf's are defined to accept several rdf resources for a a single parameter? Could you please refer to any piece of code that I can modify to such purpose?

Thanks for the support

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