Typically, if a local attribute doesn't lead to a matching relation, we simply skip that attribute silently.
Often we assume that all such local attribute values should have matches. For instance, for each StudentGroup we assume that its school unit attribute matches one of the existing SchoolUnit objects in the data source.
It would be nice if we could get an (optional) warning and summary of all local attribute values which didn't lead to a match. Whether or not we get a warning could be specified on the relation.
Typically, if a local attribute doesn't lead to a matching relation, we simply skip that attribute silently.
Often we assume that all such local attribute values should have matches. For instance, for each StudentGroup we assume that its school unit attribute matches one of the existing SchoolUnit objects in the data source.
It would be nice if we could get an (optional) warning and summary of all local attribute values which didn't lead to a match. Whether or not we get a warning could be specified on the relation.