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  • Re: Using ORM to Model User-defined DataTypes

    A payer always has a first and a last name among other attributes. &nbsp;Is this true? For example: If you sell something via Amazon, then Amazon collects the Payment from the Buyer, deducts a percentage and then pays the rest to you.In this scenario, the Buyer plays the role of Payer because the Buyer pays money to Amazon. Then ...
    Posted to ORM Techniques (Forum) by Ken Evans on Fri, Oct 21 2016
  • Re: Using ORM to Model User-defined DataTypes

    &nbsp;If your&nbsp;text means that&nbsp;you are only interested in &quot;Human Persons&quot;, then the object-role model is much simpler. Here is the verbalization for the fact type &quot;Person has CustomerNr with Company&quot;Person has CustomerNr with Company. For each CustomerNr and Company, at most one Person has that CustomerNr with ...
    Posted to ORM Techniques (Forum) by Ken Evans on Thu, Oct 20 2016
  • Re: Using ORM to Model User-defined DataTypes

    OK - here is an outline&nbsp;of &quot;where I am coming from&quot; on this one.&nbsp; When&nbsp;creating an object-role model an ORM analyst starts by listening to people that we call &quot;domain experts&quot; and looking at the forms that they use to communicate information. A &quot;domain expert&quot; is someone who knows a lot about the ...
    Posted to ORM Techniques (Forum) by Ken Evans on Thu, Oct 20 2016
  • Re: Using ORM to Model User-defined DataTypes

    &nbsp;After a bit of thought, I made this model which I hope is of help. Ken &nbsp;
    Posted to ORM Techniques (Forum) by Ken Evans on Thu, Oct 20 2016
  • Re: Using ORM to Model User-defined DataTypes

    Can you explain why&nbsp;you want to start by&nbsp;defining an object type that has a user defined type as a reference scheme? Other comments:&nbsp; A &quot;Customer&quot; is a role that is played by a &quot;Person&quot; (where a Person can be a legal entity such as a Company or Government department) In my experience,&nbsp;customers are ...
    Posted to ORM Techniques (Forum) by Ken Evans on Wed, Oct 19 2016
  • Re: Where to start with mapping equality set constraint to sql check constraint?

    &nbsp;Hi Bill, Thanks for your post.&nbsp;I&#39;ll work on this and get back to &nbsp;you. Ken&nbsp;
    Posted to Developers (Forum) by Ken Evans on Sat, Sep 10 2016
  • Re: Where to start with mapping equality set constraint to sql check constraint?

    &nbsp;Hi Bill, If you look at the forum, you will see that you are one of many people&nbsp;who has tried to&nbsp;understand the NORMA code with a view to&nbsp;fixing&nbsp;bugs and/or adding new features.&nbsp; Matt really is&nbsp;the&nbsp;best person to answer this question but&nbsp;whilst he is aware of your question,&nbsp;he is&nbsp;snowed ...
    Posted to Developers (Forum) by Ken Evans on Sat, Sep 10 2016
  • Re: Which solution/project types?

    &nbsp;Hi Paul, Before you can use an object-role modeling file with Visual Studio, you have to install NORMA. (Downloadable from the library) Then, if you want to create a new .orm file in Visual Studio, you&nbsp;use File&gt;New&gt;File,&nbsp;scroll down the list and click on &quot;Object-Role Modeling file. If you want to use&nbsp;an existing ...
    Posted to Technical support (Forum) by Ken Evans on Fri, Jul 15 2016
  • Re: Subtypes

    There are two stages in making subtypes in NORMA. The&nbsp;first stage is&nbsp;to make sure that you are using the&nbsp;ORM subtype paradigm to think about your Universe of Discourse(UoD). The ORM subtype paradigm is&nbsp;based on sets and&nbsp;membership of sets. Terry&#39;s 2008 book discusses this and this website has an introduction. ...
    Posted to ORM Techniques (Forum) by Ken Evans on Mon, May 30 2016
  • Re: Thank you

    Hi&nbsp; Berhanou, Well done for getting your Masters Degree. The results of your hard work should serve as an inspiration to others. Thanks for your comments and kind words.&nbsp;I&#39;m glad I was able to help. Ken&nbsp;&nbsp; &nbsp;
    Posted to Contributed Models (Forum) by Ken Evans on Mon, Mar 28 2016
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