Hi Jörg Battermann,
Thank you for writing.
The project that you are describing sounds very interesting indeed.
In order to have a dynamic persistent model you could use the "artificial fields" feature of OpenAccess.
You can look at the following links for more information:
However, in order to be able to help you more I will need some more information about your project.
Do I understand correctly that the different implementations of IProjectElement will have some added fields (other than the ones from the interface)
and you want to be able to persist those?
It will be very helpful if you can share more details about the project elements. What is the default implementation? What will be an example implementation in an add-in? What fields do you want to persist and how?
Also, in order to be able to persist project element settings from the add-ins without having a reference to OpenAccess you will definitely need some kind of service that will make available this functionality to the add-ins.
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