ASN.1: CHOICE: Choose an item among multiple items

Type: CHOICE

Description: Used to select one item from collection of items.

Example

Motorcar ::= SEQUENCE {
    carRegNumber VisibleString
}

Bicycle ::= SEQUENCE {
   bicycleColor VisibleString,
   bicycleModel VisibleString
}

Boat ::= SEQUENCE {
    boatRegNumber VisibleString
}

PreferredVehicle ::= CHOICE { car Motorcar, bicycle Bicycle, boat Boat }

Example Schema

Motorcar ::= SEQUENCE {
    carRegNumber VisibleString
}

Bicycle ::= SEQUENCE {
   bicycleColor VisibleString,
   bicycleModel VisibleString
}

Boat ::= SEQUENCE {
    boatRegNumber VisibleString
}

PreferredVehicle ::= CHOICE { car Motorcar, bicycle Bicycle, boat Boat }

Person ::= SEQUENCE {
    name VisibleString,
    id VisibleString,
    preferredVehicle PreferredVehicle
}

Sample data for above schema

person Person ::= {
    name "Rama Krishna",
    id "I123456",
    preferredVehicle bicycle: {
        bicycleColor "Blue",
        bicycleModel "Hero 42M"
    }
}

XML encoding of above data

<?xml version="1.0" encoding="UTF-8"?>
<Person>
  <name>Rama Krishna</name>
  <id>I123456</id>
  <preferredVehicle>
    <bicycle>
      <bicycleColor>Blue</bicycleColor>
      <bicycleModel>Hero 42M</bicycleModel>
    </bicycle>
  </preferredVehicle>
</Person>

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