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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).
<img src="http://bibwild.wordpress.com/files/2008/02/umlaut-serviceresponse.jpg" />
===Obligations of Service logic===
