Scheme identifier
    The identification scheme identifier of the Item standard identifier.
About
    - ID
- IBT-157-1
- Cardinality
- 1..1
- Section
- Shared
- Name
- Scheme identifier
- Syntax binding
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- Rules
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            - IBR-CL-21: [ibr-cl-21]-Item standard identifier scheme identifier (ibt-157) MUST belong to the ISO 6523 ICD list.