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  • 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.&nbsp; Cheers Terry&nbsp;
    Posted to Technical support (Forum) by Terry Halpin on Tue, Apr 28 2015
  • Re: ORM to UML

    &nbsp;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 &quot;value&quot; or &quot;text&quot; to record the actual title, and add another attribute called &quot;restrictedGender&quot; 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

    &nbsp;Currently, NORMA doesn&#39;t generate UML class diagrams from an ORM model. This is something we&#39;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. &nbsp; 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

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

    &nbsp;Hi Matt (Nizol) Matt Curland&#39;s response is quite correct and should clarify the issue for you.&nbsp; Please note however, that the BBB does not claim that elementary fact roles are mandatory for a primitive entity type. The p. 161 reference you mentioned includes the following condition &quot;unless declared independent&quot;. Also, ...
    Posted to ORM Techniques (Forum) by Terry Halpin on Wed, Apr 1 2015
  • Re: Transitive implication in a subtype graph

    &nbsp;Subtyping in ORM is always direct subtyping, not indirect subtyping. Direct subtyping is strongly intransitive, so transitively implied subtyping relationships should not be asserted. &nbsp; Cheers Terry&nbsp;
    Posted to NORMA (Forum) by Terry Halpin on Sat, Mar 28 2015
  • Re: Model elements that are not displayed on any diagram

    &nbsp;NORMA allows an ORM schema to be displayed on many pages. The same model element may be displayed on many pages. It can be convenient to remove some shapes from a page to better focus that page on a specific subarea of the overall schema. There&#39;s probably little practical value in removing the final shape of a model element if you want ...
    Posted to NORMA (Forum) by Terry Halpin on Wed, Mar 11 2015
  • Re: Role value constraints in ORM2

    &nbsp;Yes, that&#39;s correct. I added role value constraints to ORM 2 in the mid 1990s. Before that, they applied only to object types. Cheers Terry&nbsp;
    Posted to ORM Techniques (Forum) by Terry Halpin on Tue, Aug 12 2014
  • Re: What is a fact?

    Hi Ken Although I am not a fully fledged Platonist, I could be classified as one kind of realist, as the term is currently used in philosophy. Your quote from Russell (1920) where he treated a proposition simply as a declarative sentence represents a position that few philosophers (other than Epstein, apparently) would agree with nowadays. ...
    Posted to Philosophy (Forum) by Terry Halpin on Fri, Mar 28 2014
  • Re: What is a fact?

    Hi Ken Sentences are linguistic, but propositions are not. Utterances are speech acts, not propositions. A proposition is what it is that is asserted when a declarative sentence is uttered or inscribed. Of course, to determine the precise proposition expressed by an utterance or inscription of a sentence, one has to know the relevant context of ...
    Posted to Philosophy (Forum) by Terry Halpin on Thu, Mar 27 2014
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