I have an issue with modeling in my business
tag has two types of alarms : state and analog alarm
the tag must have one alarm : state or analog alarm
knowing that i don't have any unique property about alarm , how can it be modelled ?
the logic in the screenshot
The model in your screenshot does not give you the ability to know which type of alarm a tag is related to. You could use something like shown the screenshot below. Here you have Alarm nodes that also have second label indicating what type of alarm they are. A Tag is then related to one type.
If you don't want two labels, then you could have Alarm nodes and specify the type as a property.
There is no constraint that you can require one property OR another.
You can place an existence constraint on a single property. Perhaps the value of this property can indicate the type of alarm?
I suggest that you post modeling questions here:
Elaine
