11. Subfield indicators and punctuation in the CBS MARC 21 format Last updated Save as PDF The translation on this website may be generated by machine translation. The quality and accuracy of machine translation can vary significantly from one text to another. Read the page in original English here. 01. Introduction02. Starting points03. Tags and subfields with subfield indicators consisting of 3 characters – bibliographic format - general overview04. Tags and subfields with subfield indicators consisting of 3 characters – bibliographic format - specifications per field05. Tags and subfields with subfield indicators consisting of 3 characters – authority format - general overview06. Tags and subfields with subfield indicators consisting of 3 characters – authority format - specifications per field