After reading several related Answers I believe that the following problem has still not been addressed. Here it is:
I would like to generate attributes according to existing and a-priori unknown attribute values.
For example: Let's say that an Attribute A exist with attribue values X1, X2 and X4. And let's say an unknown unique attribute value, attribute value X5, is added to Attribute A. The requested method should then generate the attributes X1, X2, X4 and X5. They will exist next to the already existing attribute A.
Does anyone know the Answer?
?Kind regards, Jochgem