B-ISUPMessages 
  + B-ISUPParameters 
  | + B-ISUPParameterIndicators 
  | + B-ISUPInformationElementHeaders 
  | + B-ISUPParameterConstructions 
  | | + B-ISUPParameterIndicators 
  | | - B-ISUPParameterElements 
  | - B-ISUPParameterElements 
  - B-ISUPInformationElementHeaders