RE: Microsoft's DISCO proposal and XML packaging
My system won't let me have the SCL document, so I can't look at that right now. The rest of this is interesting for contract based services. Does SCL include negotiation or does it only enable a contract for a pre-specified service with non-negotiable terms? IOW, to what degree and by what means can a service be customized? Since I don't have the schema for the discovery vocabulary, I can't assume much about the typing of the links defined for it. They appear to be simple links. They don't appear to be controversial with regard to an XLink definition but I may be missing something. I agree that XLink specification is useful but given the paucity of implementations, may not be that useful at this time and they may want to move forward. On the surface, this appears to define a clear algorithm for the discovery behavior insofar as the service can be found, and a means to bind to some part of that. Further, it provides a means to specify the binding if it is known apriori (without opening the document). So, they seem to be trying to define very basic discovery system similar to the kind of metaphor used by objects that provide a basic interface by which further interfaces can be "discovered". That is pretty much in accordance with the early papers on enterprise engineering for distributed systems. Probably a good start and insightful with regards to establishing a semantic for establishing a contract. Since I can't read SCL, it isn't possible to see how deep this goes. Len Bullard Intergraph Public Safety clbullar@i... http://fly.hiwaay.net/~cbullard/lensongs.ram Ekam sat.h, Vipraah bahudhaa vadanti. Daamyata. Datta. Dayadhvam.h From: Simon St.Laurent [mailto:simonstl@s...] Some sort of discovery mechanism, possibly though not necessarily using HTTP, seems very much in order, however, and I hope this proposal moves discussion forward.
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