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Subject: Re: [soa-rm] [issue:structure] draft 07, sect 2, line 201, Figure 2-1
The data model is a constraint in the sense that the model constrains the forms of data accepted/generated by the service. There is a very smooth progression from syntactic constraints, process constraints, quality of service constraints, security constraints, business constraints, legal constraints etc. etc. Frank On May 20, 2005, at 3:18 PM, Michael Stiefel wrote: > How is the data model a constraint? > > If everything is constraint, what is being constrained? > > Michael > > At 05:56 PM 5/20/2005, Francis McCabe wrote: > >> I would prefer to see >> 1. policy, contract linked together -- reflecting the contract=agreed >> policy idea. >> 2. data model is one of the constraint types, like policy and >> contract >> 3. we should also mention process model if we are going to call out >> the data model. >> >> Being a total pedantic, policy, agreement, process model, data model >> together characterize the semantics; however, the metadata/service >> description is a projection of that semantics (there may be several >> service descriptions for one service). >> >> Frank >> >> >> On May 20, 2005, at 2:44 PM, Duane Nickull wrote: >> >> >>> Michael: >>> >>> Thanks - I tried it horizontally and for some weird reason, it >>> seems to resonate better. >>> >>> If we can get Frank's sign off and no one else has any opposition, >>> maybe we can use this one? >>> >>> One other thought - should Data Model be larger? In the book >>> Documenting Software Architectures, I seem to recall some >>> conversation about size mattering (yeah yeah). Accordingly, I >>> enlarged the data model to give it more presence. How does this >>> look? See attached Core RM6.png >>> >>> Duane >>> >>> Michael Stiefel wrote: >>> >>> >>> >>>> Would going from right to left or left to right remove any >>>> associations of top and bottom as more natural or more fundamental? >>>> >>>> Have you ever looked at a globe with the Southern Hemisphere at >>>> the top? To most of us that live in the Northern Hemisphere it >>>> looks wrong, but of course, from the point of view of outer space >>>> either pole of the globe could be on top. >>>> >>>> I like the fact that semantics will be explained on the side. >>>> >>>> Michael >>>> >>>> >>>> At 02:37 PM 5/20/2005, Duane Nickull wrote: >>>> >>>> >>>> >>>>> Here is a rendering based on Greg's diagram that accounts for all >>>>> the comments below. >>>>> >>>>> - I placed Metadata as a bracket inside the "service description" >>>>> box. >>>>> - Semantics will have to be explained using text accompanying >>>>> this diagram to state that they are omnipresent. >>>>> - turned the stack upside down so service is at the bottom. To >>>>> me, it seemed more intuitive that the thing that is core is at >>>>> the bottom and the other items are built out (up??) from it. >>>>> Comments? >>>>> - used the UML dependency arrow as the convention between service >>>>> and service description to denote that a SD should not exist >>>>> without a service. >>>>> - redrew the line between metadata and policy / contract to >>>>> connect with the outer container of "constraints" >>>>> - removed the words "enables discoverability" from the >>>>> association. >>>>> >>>>> If we use this, we should probably build an appendix containing >>>>> clear and concise rules about how to interpret this mind map >>>>> since it borrows association conventions from UML and mixes them >>>>> together with other conventions. >>>>> >>>>> Comments? >>>>> >>>>> Duane >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> >>>> <CoreRM6.png> >>>> >> >> > > >
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