# concept[].definition
The property value is a code that identifies a concept defined in the code system.

# concept[].definition
The property  value is a code defined in an external code system. This may be used for translations, but is not the intent.

# concept[].definition
The property value is a string (often used to assign ranking values to concepts for supporting score assessments).

# concept[].definition
The property value is a boolean true | false.

# concept[].definition
The property is a date or a date + time.