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  • Re: Exclusion constraints

    Hi Niels, Yes - it is all about Philosophy - where I use the term to mean &quot;The practice of making sense of the world&quot;. [quote user=&quot;Niels Hoogeveen&quot;]Does there exist something like a &quot;naked&quot; fact? [/quote]&nbsp; I would say &quot;no&quot; - Facts only exist because they have been asserted by a person. (A fact maybe ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Tue, Mar 18 2014
  • Re: Exclusion constraints

    &nbsp;[quote user=&quot;Clifford Heath&quot;]Ken, yours may be a fair comment in many cases [/quote] Clifford, It was not my intention to make a &quot;fair comment.&quot;&nbsp; My intention was to assert propositions about the nature of the relationship between &quot;facts&quot; and &quot;beliefs&quot;. Specifically: a)&nbsp; A belief ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Tue, Mar 18 2014
  • Re: Exclusion constraints

    Hello Niels, Here is a model that (I hope) explains what I am trying to say. Which is that a belief about a fact is not that same thing as the fact itself. Although this example is about job start and end times, the model is a general model that can be applied to any fact. A person utters a fact.&nbsp;(By &quot;utter&quot; I mean that the ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Tue, Mar 18 2014
  • Re: Exclusion constraints

    Clifford, Firstly, &quot;Belief&quot; &nbsp;does not exist as an independent thing. For a belief to exist, there must be at least one person (who is alive today or is not alive today) who holds (or used to hold) that belief. (e.g. Geocentricity) Secondly, what people believe or do not believe can be expressed as an elementary fact. &nbsp; Thus, ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Tue, Mar 18 2014
  • Re: Exclusion constraints

    Hi Niels, Just to keep the ball rolling until Terry gets a chance to reply, here is another straw man model that relates to your last post. Please feel free to comment on or shoot at my model. It will help others to see what can be done and either how to do it or how not to do it. Ken
    Posted to Extensions to ORM (Forum) by Ken Evans on Mon, Mar 17 2014
  • Re: Exclusion constraints

    &nbsp;Hello Niels, The nice thing about ORM is that it is really easy to change the model based on feedback from the people who have &quot;the problem&quot;. I have always found it easier to start with a &quot;straw man&quot; model rather than from a blank sheet because this makes it much easier for people to see when a model does not express ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Sun, Mar 16 2014
  • Re: Exclusion constraints

    Hi Niels, I have &quot;brewed&quot; a model that includes a bit more context than your example. Why? Well, I thought that a slightly bigger model would be more helpful in showing the relationship between ORM and PostgreSQL. I just put three files into the Library:1: The object-role model itself (a .orm file made with NORMA running in Visual ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Sun, Mar 16 2014
  • Re: Exclusion constraints

    &nbsp;Hello Niels, I&#39;m working on a model for your &quot;teacher, classroom,booking&quot; problem and I hope to have it done by sometime tomorrow. In the meantime, I found several offers for Visual Studio on Ebay.co.uk. Many of them are in the £50 to £100 range. Matt has said that there are no functional differences between the various ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Sat, Mar 15 2014
  • Re: Exclusion constraints

    Hello Niels, The ORM specification includes exclusion constraints. (By &quot;ORM specification&quot;, I&#39;m referring to the explanations in the 2008 book written by Terry &amp; Tony.) However, not all the features mentioned in the book have yet been implemented in the NORMA tool. In addition, the DDL generators in NORMA are at different ...
    Posted to Extensions to ORM (Forum) by Ken Evans on Fri, Mar 14 2014
  • Re: What is data quality?

    &nbsp;[quote user=&quot;Clifford Heath&quot;]quality is sufficient to meet the need[/quote] Hmm, If you look up the principles of semiotics, you will find that words out of context just don&#39;t have any meaning (References: Saussure, Peirce, Sebeok)&nbsp; amongst others. And in particular, written words are just character strings that don&#39;t ...
    Posted to Data Quality (Forum) by Ken Evans on Fri, Mar 14 2014
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