The mime code of the attached document.

Usage
Mandatory
Example value
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Code lists
Mime code (IANA Subset)
Rules
Identifier/Error message Flag
EHF-P09-CHA-B02602
Value MUST be part of code list 'Mime code (IANA Subset)'.
fatal