tosca.datatypes.Root:
  description: The TOSCA root Data Type all other TOSCA base Data Types derive from

string:
  derived_from: tosca.datatypes.Root

tosca.datatypes.Credential: 
  derived_from: tosca.datatypes.Root
  properties: 
    protocol1: 
      type: string
      required: false
    protocol2: 
      type: string
      required: false