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  • Re: ORM and FCIOM

    Hi Berhanu Regarding the 1996 paper by Weber and Zhang, I disagree with some of the claims made in that paper, and not see "construct overload" as a problem for NIAM or ORM. It is not uncommon for people to argue that NIAM and ORM are too expressive in their graphical notations, but I believe it is very convenient for modelers to ...
    Posted to Technical support (Forum) by Terry Halpin on Mon, May 25 2015
  • Re: Modeling that the newest bid is higher than any existing bid

     Hi Matt Yes, www.factbasedmodeling.org is the website for the FBM Working Group. To get access to the metamodel, I suggest you join the working group, which is chaired by Serge Valera (see the membership page).  Cheers Terry 
    Posted to ORM Techniques (Forum) by Terry Halpin on Fri, May 22 2015
  • Re: Modeling that the newest bid is higher than any existing bid

    Hi Jacob The FBM metamodel contains numerous examples of verbalizations of derivation rules, but we have not yet published the dynamic rule syntax. Cheers Terry.
    Posted to ORM Techniques (Forum) by Terry Halpin on Wed, May 20 2015
  • Re: Modeling that the newest bid is higher than any existing bid

     Hi Jacob   As I indicated earlier, your problem can be handled more efficiently using a dynamic rule. We have specified extensions to ORMs rule syntax to support such rules, which can refer directly to states immediately previous to a transaction (e.g. the previous bid), but have not yet implemented this rule syntax in NORMA, so ...
    Posted to ORM Techniques (Forum) by Terry Halpin on Wed, May 20 2015
  • Re: Modeling that the newest bid is higher than any existing bid

     Hi Jacob   First let me correct an obvious omission from my previous rule, which should have read as follows: * Bid1 is highest for Advertisement if and only if       that Bid1 is for that Advertisement and offers some Price1       and no Bid2 <> Bid1 and is for that Advertisement ...
    Posted to ORM Techniques (Forum) by Terry Halpin on Fri, May 8 2015
  • Re: Modeling that the newest bid is higher than any existing bid

     Hi Jacob   Assume the ORM schema contains the following fact types, each of which is mandatory and many-to-one. Bid(.Nr) is for Advertisement(.Nr). Bid is by Consumer(.Nr). Bid offers Price(USD:). Bid is made on Date(ymd).  Now you may define the derived fact type "Bid is highest for Advertisement" (optional, ...
    Posted to ORM Techniques (Forum) by Terry Halpin on Tue, May 5 2015
  • Re: Generate Class Diagram in UML

    Hi Berhanu, Simply drag a Model Note shape from the Toolbox to the diagram window, and then add or copy the text into the shape.  Cheers Terry 
    Posted to Technical support (Forum) by Terry Halpin on Tue, Apr 28 2015
  • Re: ORM to UML

     The workaround I use is to create a class for the attribute. For the example on p. 404, create a class called PersonTitle and give it an attribute called "value" or "text" to record the actual title, and add another attribute called "restrictedGender" then add a textual constraint (e.g. in OCL) to capture the ...
    Posted to Technical support (Forum) by Terry Halpin on Sat, Apr 18 2015
  • Re: Generate Class Diagram in UML

     Currently, NORMA doesn't generate UML class diagrams from an ORM model. This is something we'd like to support in the future. For a basic procedure on how to manually map ORM to UML, see section 9.8 of Information Modeling and Relational Databases, 2nd edition.   To copy an ORM diagram to the clipboard, right-click an empty ...
    Posted to Technical support (Forum) by Terry Halpin on Wed, Apr 15 2015
  • Re: Implicit disjunctive mandatory constraint

     Hi Matt  Your initial statement of your new understanding of  implicit disjunctive mandatory role constraints is basically accurate. As a fine point, we now say that an object type "hosts" a role, whereas an object instance "plays" a role.  Regarding your first follow-up question, the role hosted by Study ...
    Posted to ORM Techniques (Forum) by Terry Halpin on Wed, Apr 1 2015
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