Attached document Mime code
    A code indentifying the file type.
About
    - ID
- IBT-125-1
- Cardinality
- 1..1
- Section
- Aligned
- Name
- Attached document Mime code
- Syntax binding
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- Rules
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            - IBR-CL-24: [ibr-cl-24]-Mime code (ibt-125-1) MUST be according to subset of IANA code list.