[1] Extended size of short_name (from 16 to 64)
[2] res_description set to NULLable
[3] validated_by set to NULLable
[4] table_column::std set to NULLable because although I added default value
   in the case of the intf_param table (and there is is indeed
   NOT NULL, in the case of the table_column table, there is no
   default value specified in the XSD schema.
Once I implement XSD-validation-filtering changes [1], [2] and [3] (but
not [4]) should be undone.
managed to maintain in an organized and reportable way all exceptions encountered during the loading of the files