// Adapted from docs.tind.io/article/vwihxqwp67-marc-fields-used-by-tind // Retrieved 2021-01-15

// Note: this only includes fields relevant to our TIND/DA implementation.

035 - EXTERNAL IDENTIFIER (NR)

Indicators
   First - Undefined
      # - Undefined
   Second - Undefined
      # - Undefined
Subfield Codes
   $a - External identifier (NR)

// TODO: is (NR) correct for $p and $q? 909 - OAI REPOSITORY METADATA (NR)

Indicators
   First - ???
      C - ??? // Yes, caps should be invalid; yes, TIND does it anyway
   Second - ???
      0 - ???
Subfield Codes
   $o - OAI URI for the record (oai:<hostname>:<record ID>) (NR)
   $p - setSpec for current valid sets (NR)
   $q - setSpec for previously valid sets (NR)

// TODO: is (R) correct here? 980 - COLLECTION QUERY TAG (R)

Indicators
   First - Undefined
      # - Undefined
   Second - Undefined
      # - Undefined
Subfield Codes
   $a - Collection identifier

991 - RESTRICTION STATUS (NR)

Indicators
   First - Undefined
      # - Undefined
   Second - Undefined
      # - Undefined
Subfield Codes
   $a - Restriction tag