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Interoperability can be achieved by autonomous applications that inquire of a source what types it can produce and being able to recognize those types. There is no free lunch here. Discovery-based systems will work reasonably well. The web functions because the HTTP operations are fixed and their semantics are well understood, and because one dominant type (HTML) rules the majority of transactions. len From: W. E. Perry [mailto:wperry@f...] It is only the output--not some contractual form of input--which makes each of those applications of interest and which, when published in a Web-accessible way, is the basis on ongoing interoperability with still further applications.
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