The ORM Foundation

Inter-predicate role-path editing is not yet implemented in NORMA for VS2017. Yesterday,  Terry added some clarification to the role path editing issue. This is the relevant part of what he said.NORMA for VS2017 automatically infers the join path for unambiguous cases (e.g. Figure 10.4 of the "Big Brown Book", and in your example, ...

 Nicola, I posted a question about the Kohler paper in the "database experts" group on LinkedIn. Fabian Pascal confirmed my own view that logical models are not related to physical models.  This is what Fabian said;  One of the most common and entrenched misconceptions is the logical-physical confusion (LPC) (another ...

 "The model is loosely  based on an example from Koehler" Kohler gives this example of a relation:  R ={Student, Course, Chapter, Time, Room} Whilst this may be true in mathematical terms, it does not contain the ORM concept of using a predicate to define the roles played by each of the "attributes" in the ...

 Thanks for the orm file. I think that it would be useful to split this discussion into two separate subjects. (1) "Role paths in NORMA" and (2) "How to design an object-role model".  Inter-predicate role-path editing is not yet implemented in NORMA for VS2017. (2) Designing object-role models You said that your ...

Thanks for posting your updated model.  However, it would be helpful if you could post the "equivalent" ORM file, because that would allow people to use the powerful features in NORMA to review your model. . 

 Nicola, I see that your model is named "Koehler2007s.orm" If this is a reference to a publication, please let me have the reference so that I can follow up. Thanks Ken  

The simple answer is "partially". Since it is Terry's book, I have asked him to give a response. In the meantime, if you put "join path" in the search box at the top right and select "entire site" , you will see that join paths have been "in discussion" for about ten years.  Ken

My Mac/Windows question was related to our earlier discussion about the two ways of running Windows on a Mac. I don't know if NORMA will run on Visual Studio for Mac because I don't have a Mac to test it. Anyway, well done for getting NORMA running. Ken 

Are you running this on a Mac or on a Windows PC? Please check that you have installed the following Visual Studio workloads.  .NET desktop development ASP.NET and web development Visual Studio extension development.  

Jim, As I mentioned in my email, I suggest that you re-orient by going through the NORMA Tutorials that you can download from the library. Since you have successfully installed NORMA, you should proceed as follows : Start Visual Studio. Start NORMA by:   File>New>File then scroll down to  "Object Role Modeling File" ...