Abstract: The invention includes a data processing system, a method and a business method. The method links multiple parties: a “publisher”, a “Subscriber”, and an intermediary information exchange engine which facilitates information exchange between the publisher and the subscriber over a data network (typically the public network known as the “Internet”). Metadata is transferred from the publisher to the subscriber, via the intermediary by application of a schema transform applied in software run by the intermediary. Normalized data is transferred substantially without modification from the publisher to the subscriber, provided that the intermediary is able to verify that the subscriber has been previously authorized to receive the particular data. Subscriber status is specified for each distinct type of data, by previous consensus of the first and second parties.