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  • Re: Documentation On Data Model

     Hi Paul, What was trying to point out with my Wittgenstein reference is the context of ORM.  Saying that ORM is a formal language begs the question: What is language?   Wittgenstein had an interesting perspective. Ken  
    Posted to Developers (Forum) by Ken Evans on Wed, Feb 7 2018
  • Re: Documentation On Data Model

     Hi Paul, "What you need to represent." are the rules of first-order predicate logic and set theory. Wittgenstein's "Philosophical Investigations" also provides a useful perspective on "the problem" . The  Macat book (Kindle)  gives a useful analysis.  You have a lot of work ...
    Posted to Developers (Forum) by Ken Evans on Tue, Feb 6 2018
  • Re: Documentation On Data Model

     Hi Paul, That's quite an ambitious goal. 1: Recent documentation  Terry's 2008 book contains the functional specification (It's the brown book in the side bar on the right)    Some time ago, we discussed an ORM metamodel in this thread?  (We use ORM to specify ORM) The ORM metamodel work has been continued ...
    Posted to Developers (Forum) by Ken Evans on Tue, Feb 6 2018
  • Re: NORMA within visual studion 2015

    Hi Rob, I have recently bought a new PC and installed VS2015 update 3 and the version of Norma that can be downloaded from the Library on this website -so it does work! What I suggest that you do is to uninstall NORMA and PLiX from "Windows- Add or Remove programs" Then run the PliX msi followed by the NORMA msi that you will see when ...
    Posted to Discuss documentation (Forum) by Ken Evans on Thu, Feb 1 2018
  • Re: Visual Studio 2017 support

    Hi Elena, NORMA is not part of Visual Studio (VS), NORMA is an extensionto VS.I discussed ORM with Microsofts Visual Studio manager in 2001 and my most recent contact with a person from Redmond was in late 2016. Much of Microsofts income is derived from selling licenses for their software. However, NORMA is open source and free. Microsoft ...
    Posted to Developers (Forum) by Ken Evans on Wed, Jan 24 2018
  • Re: Constraints on Constraints?

    Here is my first attempt to partially model your situation.  I'm still looking into the most effective way to specify your required dependencies: Some Person can promise some Outcome if that Person has some Plan to realize that Outcome  OR  if that Person has contracted some Person torealize that OutcomeYou can download ...
    Posted to Open Discussion & Feature Requests (Forum) by Ken Evans on Thu, Dec 21 2017
  • Re: Constraints on Constraints?

    Thanks for the clarification. I'll make a more comprehensive reply later today but two points stand out. My first point is that when defining an object-role model you must bear in mind that language is not a neutral window through which we view "reality". In particular, Not all propositions are equal.  For ...
    Posted to Open Discussion & Feature Requests (Forum) by Ken Evans on Thu, Dec 21 2017
  • Re: Constraints on Constraints?

    ORM Fact Types are made by adding Object Types into "holes" in a predicate. For example here is a binary Fact Type: Predicate: --- writes ---      Object Types: Student(.nr), Dissertation(.nr) Fact type:   Student(.nr) writes Dissertation(.nr) A related ternary Fact Type might look like this: Predicate: ...
    Posted to Open Discussion & Feature Requests (Forum) by Ken Evans on Wed, Dec 20 2017
  • Re: Constraints on Constraints?

    There are several forum threads that discuss the inclusive and exclusive OR constraints.  For example: http://www.ormfoundation.org/forums/p/1202/3830.aspx#3830 You can use the search feature to find more.    It will help us to help you if you can give an example of what you are trying to model. Thanks Ken     
    Posted to Open Discussion & Feature Requests (Forum) by Ken Evans on Wed, Dec 20 2017
  • Re: Reverse engineering

    To the best of my knowledge, NORMA imports what is in the catalog of an RDBMS schema. So what you are seeing in the object-role model is what is in the RDBMS catalog. Thus there is no way automate the import of what is not there in the first place. It's a long time since I looked at the code but I suspect that the import code may use  ...
    Posted to Open Discussion & Feature Requests (Forum) by Ken Evans on Tue, Nov 28 2017
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