0fd8a116_st_with_Ron_Jacobs___Channel_9__Transcript
[Speaker] Ian [Start Time] 0:09:09.1 [Transcript] 
Now, each of those consumers might only be interested in small amount of information in that message. Typically, if they did XSD validation and they doing all or nothing validation of that entire document. But if the consumer had some way of telling the provider, “Well I am interested in these particular fields, that’s the nature of my contract with you as a provider, please guarantee that in the future whatever you do, as you evolve, you maintain that very particular contract and that contractual interest, or expectations that I have with you.” And then if the provider conveyed informed of each of those set of expectations, that come from different consumers, then they really have a total set of expectations that they have to continue to fulfill, but everything else that falls out side of that, outside that set of expectations is up for grab, they can change it willy-nilly.
ARCast - The Evolution of Architecture with Martin Fowler | ARCast with Ron Jacobs | Channel 9
Transcript