… by a distinct community for its purposes, and is largely unusable by others. It is common to see whole data archipelagos comprised of thousands of separate resources [Ston00]. We would, … need metadata, e.g., timestamps, access control lists, lineage, units, accuracy, point of contact, etc., especially for derived values. (Security metadata is needed if the recipient is to … “Integrating Islands of Information”, EAI Journal, Sept 1999.http://www.eaijournal.com/DataIntegration/IntegrateIsland.asp [Vass97] V. Vassalos and Y. Papakonstantinou, “Describing …