15 001
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'''20 Length of “Length of field”'''
: One decimal digit giving the number of characters in the “Length of field” part of each directory entry. The value in ''UNIMARC holdings format '' is 4.
'''21 Length of “Starting character position“'''
:One decimal digit giving the number of characters in the “Starting character position“ of each directory entry. The value in ''UNIMARC holdings format '' is 5.
'''22 Length of implementation-defined portion'''
:A decimal digit giving the number of characters in the implementation-defined portion of each directory entry. As a UNIMARC directory entry does not contain such a portion, the value in UNIMARC is 0.