The bundle index lacks information about the origin of the data (such as https://plc.directory), so a new index property "origin" should be added to the specification.
Based on this information, we can then add a check to prevent mixing different datasets.
Solved in https://tangled.org/@atscan.net/plcbundle/commit/92d01766f1419afc081cf70c45462cdab11b81d2