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How to create Attribute on RRC project

One answer

The programmatic REST API to use is the OLSC interface RRC provides. Good entry point how to get started is the OSCL Workshop.
But to answer you question, the RRC data types, attributes types and artifact types are read only using OSLC.
But to answer you question, the RRC data types, attributes types and artifact types are read only using OSLC.