Content Comparison

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• Tag
  • Required/Optional
  • MARC Tag field name (Tenant cannot override) 
  • MARC Tag - help URL (Tenant can override) 
• Indicator 
  • Indicator 1 and Indicator 2
    • Tenant cannot change Indicator name specified by MARC 
    • Tenant cannot change Indicator codes and Indicator code names specified by MARC 
    • BUT Tenant can add/append more valid Indicator codes and Indicator code names NOT specified by MARC (IOW can define local indicator codes and indicator code names) 
    • Undefined value must be expressed as #
• Subfield  
  • Tenant cannot change subfield name specified by MARC 
  • Tenant cannot change subfield code and subfield code names specified by MARC 
  • But Tenant can add/append more valid subfield codes and subfield code names NOT specified by MARC (if invalid value) (IOW tenant can define local subfield codes and subfield code names) 
  • Non-repeatable (NR) / Repeatable (R) 
  • Subfield is required/optional
  • Cannot specify $9 for linkable bib fields since it is reserved for authority linking
• See more details MARC Validation Rules - Definition and Acceptable values

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