If I remember correctly it was at Knowledge Technologies 2001. Ann Wrightson explained us, during the informal RDF-Topic Maps session, how to build a semantic virus for Topic Maps, through abuse of subject indicator. At the time OWL and its now infamous owl:sameAs were not yet around, but the idea was identical : if several "topics" A, B, C, ... indicate the same "subject" X, then they should be merged into a single topic. In linked data land ten years after it's the same story : if RDF descriptions A, B, C ... declare a owl:sameAs link to X, then A and B are merged together with the current description of X.
1. Harvest all the topic identifiers you can grab from distributed topic maps (read today : URIs from distributed linked data).
2. Publish a new topic map adding a common subject indicator to every topic description you have harvested (read today : add owl:sameAs X to all resource descriptions)
Now if you query the resulting data base for the description of any topic (resource) in it you get just all elements of description of everything on anything. All the map is collapsed on a single heavy and meaningless node. An irreversible semantic collapse.
|Feeding a data black hole|