1. Entry
     CDA Reference SDTC (2.16.840.1.113883.10.12.824)
    1. Entry
       CDA ExternalAct SDTC (2.16.840.1.113883.10.12.825)
    2. Entry
       CDA ExternalObservation SDTC (2.16.840.1.113883.10.12.826)
    3. Entry
       CDA ExternalProcedure SDTC (2.16.840.1.113883.10.12.827)
    4. Entry
       CDA ExternalDocument SDTC (2.16.840.1.113883.10.12.828)