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→ServiceResponse and related data structures
This data structure architecture ends up somewhat confusing (and ServiceType is probably not a clear name for that three-way join) but there are usually convenience methods defined to avoid the complexity; they should be used. See for example (tbd).
[[Image:http://bibwild.wordpress.com/files/2008/02/umlaut-serviceresponse.jpg"]Data structure diagram]Trying to figure out how to make this display inline, sorry.
===Obligations of Service logic===
