1. Section
     External Documents Section (entries optional) (2.16.840.1.113883.3.51.60.3.44)
    1. Entry
       External Document Organizer (2.16.840.1.113883.3.51.60.3.46)
      1. Entry
         BC CDA Author (Body) (2.16.840.1.113883.3.51.60.3.5)
        1. Header
           BC CDA Person (2.16.840.1.113883.3.51.60.1.5.2)
        2. Header
           BC CDA Organization (2.16.840.1.113883.3.51.60.1.5.1)
      2. Entry
         BC CDA External Documents (2.16.840.1.113883.3.51.60.3.45)
        1. @
           BC CDA External Documents (2.16.840.1.113883.3.51.60.3.45)