1. Entry
     Study Act (2.16.840.1.113883.10.20.6.2.6)
    1. Entry
       Series Act (2.16.840.1.113883.10.20.22.4.63)
      1. Entry
         SOP Instance Observation (2.16.840.1.113883.10.20.6.2.8)
        1. Entry
           Purpose of Reference Observation (2.16.840.1.113883.10.20.6.2.9)
        2. Entry
           Referenced Frames Observation (2.16.840.1.113883.10.20.6.2.10)
          1. Entry
             Boundary Observation (2.16.840.1.113883.10.20.6.2.11)