Re: "Inheritance considered harmful"
John Tigue wrote: > A note and a question. > > Note though that in Java (and seemingly in COM+) there are two types of > interitance. There are the notions of superInterface and superClass. the first is subtyping. the second is inheritance. they are kept distinct because the designers considered the multiple inheritance to be an "evil", so they permit only multiple subtyping. > ... > > The question: While class inheritance does not map to Architectural forms, > does interface inheritance map to Architectural forms? > as Paul Prescod noted, yes, the aspect which does subtyping is analogous to interfaces.on the other hand, i had understood architectural attribute definitions to apply to the derived element and thus to be effecting inheritance. so both notions map; the first to "architectural forms" and the second to "architectural attributes". > >>> That's probably because the architecture facility of ISO/IEC 10744 > doesn't > >>> *do* inheritance in the way that most people seem to expect. > >> > >>That's right. That's why people get so confused about them. The word > >>inheritance is inherently misleading when applied to architectural forms. > >> > >>Architectural forms do subtyping, not inheritance. Inheritance is about > >>"getting stuff for free" (e.g. code, declarations, fields). Subtyping is > >>about *fulfilling a particular role* (perhaps through a manual > >>construction of an appropriate "interface" (in this case a content > >>model)). Architectural forms allow you to specify an interface that must > >>be fulfilled and declare conformance to that interface. It does not allow > >>you to "get code for free" (i.e. markup declarations). > > > >Paul has made clear what I was feebly trying to say: thanks Paul. > > > >Cheers, > > > >E. xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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