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  • 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
  • Re: What is data quality?

    &nbsp;[quote user=&quot;Clifford Heath&quot;]so I disagree with Crosby[/quote] Crosby asserted that &quot;Quality is conformance to requirements&quot; So on what is your disagreement based? I&#39;m sure that it is not your intention to assert that &quot;Quality is non-conformance with requirements&quot; So please explain the basis of your ...
    Posted to Data Quality (Forum) by Ken Evans on Wed, Mar 12 2014
  • Re: Error trying to run NORMA in VS2012.

    I have the latest version of NORMA installed in VS 2008, VS 2010,&nbsp; VS2012 and VS2013. NORMA is running without problems in all of them.&nbsp; This is one for Matt. Ken
    Posted to Technical support (Forum) by Ken Evans on Mon, Mar 10 2014
  • Re: Latest version of Tutorials

    Gordon, Yes, the latest tutorials are on this site. And I agree with you that partial duplication is not a good idea. However, only Terry &amp; Matt have access to the Sorceforge account so I suggest that you ask Terry directly. Ken
    Posted to Discuss documentation (Forum) by Ken Evans on Mon, Mar 10 2014
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