#--------------------------------------------
# marc21: file(1) magic for MARC 21 Format
#
# Kevin Ford ([email protected])
#
# MARC21 formats are for the representation and communication
# of bibliographic and related information in machine-readable
# form.  For more info, see https://www.loc.gov/marc/


# leader position 20-21 must be 45
# and 22-23 also 00 so far, but we check that later.
20      string          45
>0      search/2048     \x1e

# leader starts with 5 digits, followed by codes specific to MARC format
>>0     regex/1l        (^[0-9]{5})[acdnp][^bhlnqsu-z]  MARC21 Bibliographic
!:mime  application/marc
>>0     regex/1l        (^[0-9]{5})[acdnosx][z] MARC21 Authority
!:mime  application/marc
>>0     regex/1l        (^[0-9]{5})[cdn][uvxy]  MARC21 Holdings
!:mime  application/marc
>>0     regex/1l        (^[0-9]{5})[acdn][w]    MARC21 Classification
!:mime  application/marc
>>0     regex/1l        (^[0-9]{5})[cdn][q]     MARC21 Community
!:mime  application/marc

# leader position 22-23, should be "00" but is it?
>>0     regex/1l        (^.{21})([^0]{2})       (non-conforming)
!:mime  application/marc

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