Level 3B is an acceptable format for existing serial holdings. When level 3B data is edited for any reason, it must be edited to conform with level 3A or 4. The choice of the level of input can vary from record to record for an institution. MHLD records and serials checkin records must be updated to reflect updates, i.e. cancellations, cessations, reinstatements. All hierarchical levels of enumeration appearing on the publication are used for Level 4.
All numeric information is converted to Arabic numbers, e.g. First ed.
Uppercase and lowercase characters are used as they appear on the publication. For level 3A and level 4, captions are mandatory if they appear on the publication, for level 3B captions are required if available. Enumeration data is recorded from highest level to lowest level. Use a colon to separate each level, e.g. If a serial does not carry enumeration it is not supplied.