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  • Re: SBVR - How are the instances of a concept referred by way of other related things?

    Dear Josue, Thanks for your interest in ORM and how it relates to SBVR. I&#39;m not sure I understand your question, but reference (identification) in ORM is handled basically as follows. Values (lexical objects) are constants that identify themselves, e.g. the country code &#39;AU&#39;. Entities (nonlexical objects) are ...
    Posted to SBVR (Forum) by Terry Halpin on Sat, Jan 9 2010
  • Re: Verbalisations for unary facts (CWA, OWA and OWN)

    Hi Misha Thanks for your quick response. As you indicate, our approach has always been to first declare the fact type, and later add constraints to it. The ability to speak of a fact type independent of its constraints is helpful in many ways. For example, with multi-model applications, the same fact type may appear in different models but with ...
    Posted to ORM Techniques (Forum) by Terry Halpin on Wed, Sep 9 2009
  • Re: Multiple ORM definition file support

    Hi Steve Unfortunately, NORMA does not yet support reuse of externally defined subschemas, but this is one of the features that we do plan to add, along with much better support for relational schemas (e.g. multi-page diagrams, column order control, and incremental change support). Cheers Terry
    Posted to Open Discussion & Feature Requests (Forum) by Terry Halpin on Tue, Sep 8 2009
  • Re: Verbalisations for unary facts (CWA, OWA and OWN)

    Dear Misha Thanks for your query about verbalizing unary facts and unary fact types (e.g. Person smokes). This is the first I&#39;ve heard of any business people misinterpreting NORMA&#39;s unary fact type verbalization as implying the fact type role is mandatory. If they read the fact type that way, then I&#39;m surprised they don&#39;t read ...
    Posted to ORM Techniques (Forum) by Terry Halpin on Mon, Sep 7 2009
  • Re: Column order in DDL output

    &nbsp;I agree that it is highly desirable when viewing relational tables to have them ordered in a way for convenient viewing, e.g. list the most important columns first (e.g. PK columns) and keep related columns grouped together (e.g. parts of an address or name). Unfortunately, NORMA does not let you do this yet (other than your manually ...
    Posted to Open Discussion & Feature Requests (Forum) by Terry Halpin on Thu, Jun 18 2009
  • Re: ORM2 Metamodel

    Hi Clifford I share your desire to have a common ORM2 metamodel that can be used to facilitate exchange of models between different ORM tools. As you know, I initiated a by-invitation-only forum long ago to achieve this objective, but that was discontinued after it became clear that consensus was not going to be easily obtained in this way. For ...
    Posted to Other Tools (Forum) by Terry Halpin on Mon, May 25 2009
  • Re: Collections with repeating (duplicate) items

    &nbsp;Hi Martin &nbsp; Good question.&nbsp; Modeling of collection types of various kinds (sets. ordred sets, bags, sequences, and arrays) is discussed in section 10.4 of the book. But the quick answer is that for asserted fact types, ORM currently requires at least a spanning uniqueness constraint. So the populations of asserted fact types are ...
    Posted to User experience (Forum) by Terry Halpin on Wed, Apr 29 2009
  • Re: Disjunctive Reference Schemes

    Real life is sometimes more complicated than one might wish. There are many examples in practice where disjunctive reference schemes are used (the botanical example in both editions of my book is a simplified version of one of these cases). The problem with Andy&#39;s initial example that gave rise to the error message seems to be that the ...
    Posted to User experience (Forum) by Terry Halpin on Sat, Mar 28 2009
  • Re: ORM2 Metamodel

    Hi Josue I just posted a response to your identical question on the &quot;Other Tools&quot; forum. Cheers Terry
    Posted to Request a topic (Forum) by Terry Halpin on Thu, Mar 12 2009
  • Re: ORM2 Metamodel

    Hi Josue Various versions of an ORM 1 metamodel have been published, e.g. Cuyler, D. &amp; Halpin, T. 2003, &#39;Metamodels for Object-Role Modeling&#39;, Proc. EMMSAD03: 8th IFIP WG8.1 Int. Workshop on Evaluation of Modeling Methods in Systems Analysis and Design, Velden, Austria (June). &nbsp; You can access this paper at ...
    Posted to Other Tools (Forum) by Terry Halpin on Thu, Mar 12 2009
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