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  • Re: Modeling based an existence chain

    Hi Marc, &nbsp; Thanks for the clarifications. As it happens, the particular,&nbsp;nitpicky&nbsp;modeling issue our current&nbsp;discussion swings on, is whether, in my model, the exclusion constraint holds. That is, is it possible for, say, a Claimant to work both for a Public Organization, and for a Federal Agency? &nbsp; There are other ...
    Posted to ORM Techniques (Forum) by Andy Carver on Wed, May 25 2011
  • Re: Modeling based an existence chain

    Hi Ken, You responded to my first critique -- wherein I said that since a Claimant couldn&#39;t work both for a Federal Agency and for&nbsp;a Public Organization, your ternary was non-elementary (and needs splitting). Your&nbsp; response was, mainly, that &quot;If you look closely at my diagram, you will see that I have specified three ...
    Posted to ORM Techniques (Forum) by Andy Carver on Wed, May 25 2011
  • Re: Modeling based an existence chain

    Hi Ken, Perhaps I can do as good a job re-phrasing my statement, as you&#39;ve done re-phrasing yours. I will try, in any case. But maybe what i need is to unpack, rather than condense... Anyway, my point was this: &nbsp;&nbsp;If you, or anyone else,&nbsp;should&nbsp;happen&nbsp;to put forward the principle&nbsp;that &quot;An object-role model ...
    Posted to ORM Techniques (Forum) by Andy Carver on Tue, May 24 2011
  • Re: To Null or not to Null. That is the question!

    Well said! Thanks, Mr. Darwen!
    Posted to ORM Techniques (Forum) by Andy Carver on Tue, May 24 2011
  • Re: Modeling based an existence chain

    Hi Ken, Well, I&#39;m not enough of a Star Wars buff to know what you mean by &quot;Yoda language&quot;. But perhaps the following is another example... You wrote: &quot;Well, I did not infer that from Marc&#39;s description but you may be right on this point.However, my purpose was not to present an accurate model of Marc&#39;s domain (I agree ...
    Posted to ORM Techniques (Forum) by Andy Carver on Tue, May 24 2011
  • Re: To Null or not to Null. That is the question!

    Hi Ken, If it matters, I&nbsp;still think Clifford&#39;s terminology is less problematic: First, &quot;purist&quot; does not necessarily carry any negative connotation. I doubt that Mr. Date would object to the characterisation of himself as a relational purist; in fact, I think he&#39;d happily agree with the characterisation. &nbsp;&nbsp; ...
    Posted to ORM Techniques (Forum) by Andy Carver on Tue, May 24 2011
  • Re: Modeling based an existence chain

    Hi Ken You write that &quot;My purpose was to illustrate the principle of how Marc&#39;s domain could be modeled in a way that does not require the use of nulls at the conceptual level.&quot; Ah... that&#39;s certainly different than how you characterized your purpose before. &nbsp;&nbsp; But given your new characterization of your purpose, ...
    Posted to ORM Techniques (Forum) by Andy Carver on Tue, May 24 2011
  • Re: Modeling based an existence chain

    Hi Ken, So, let me ask you a question about that object type you call &quot;Organization(.type)&quot;. Did you mean it to represent a set of (possible) organization types (e.g. {&#39;Federal&#39;,&#39;Public&#39;,&#39;NotListed&#39;} )? If so, the name of the object type should be &quot;OrganizationType&quot;, not &quot;Organization&quot; (and ...
    Posted to ORM Techniques (Forum) by Andy Carver on Tue, May 24 2011
  • Re: To Null or not to Null. That is the question!

    Ken, P.S. So I don&#39;t appear too biased for some people&#39;s tastes, I offer up an additional&nbsp;link, which at least gives both sides equal time -- in the persons of Messers Date and Codd: http://www.dbdebunk.com/page/page/1706814.htm
    Posted to ORM Techniques (Forum) by Andy Carver on Mon, May 23 2011
  • Re: To Null or not to Null. That is the question!

    Hi Ken, You complained about Clifford&#39;s use of the term &quot;relational purist&quot;, and preferred us to use the term &quot;relational conformist&quot;. I demur. I think Clifford&#39;s term is somewhat more accurate. &nbsp;&nbsp; The reason I say this is that I cannot get my head around the idea that E.F. Codd was not a &quot;relational ...
    Posted to ORM Techniques (Forum) by Andy Carver on Mon, May 23 2011
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