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There are use cases to support that same attributes need to be present in multiple role groups. For example, fracture of x and y bones, Bilateral cataracts.
The role group that must have the same attributes can be represented as a named role group by syntax such as @rolegroup . All attributes needs to be same for the name role group. For example, bilateral fracture of femur bone. Each named @rolegroup must have finding site and associated morphology.
Default value
A default value could be specified and populated in the authoring platform when a range is specified in the template.