891  Publication Pattern Data (R)

The highest level of enumeration.

The second level of enumeration.

The third level of enumeration.

The fourth level of enumeration.

The fifth level of enumeration.

The sixth level of enumeration.

The highest level of alternative numbering scheme.

The second level of alternative numbering scheme.

The highest level of chronology.

The second level of chronology.

The third level of chronology.

The fourth level of chronology.

The alternative chronology scheme.

The explanatory note citing the specific year and issue used to prepare the regularity pattern coding expressed in the field.

The Gregorian-calendar conversion of a year that is recorded in a non-Gregorian scheme in a chronology-level subfield.

The type of unit (e.g., annual buyer's guide, subject index) in the enumeration hierarchy when it has no associated sequence numbering. Subfield ǂo immediately follows the caption subfield to which it refers when subfield ǂ9 is coded 853-855. Subfield ǂo immediately follows the enumeration subfield to which it refers when subfield ǂ9 is coded 863-865.

A numeric value that represents the number of physical parts or pieces received per issuance. This technique allows for describing the behavior of items issued in parts. Subfield ǂp is only coded in cases where the number of parts or pieces is different from the publishing frequency expressed in subfield ǂw. Place all codeable frequency information in subfield ǂw.

An identification of a piece. The designation may be an identification number such as a bar code number or an accession number.

Either a number that specifies the total number of parts that comprise the next higher level of enumeration or the code var or und. Use subfield ǂu with each level of enumeration except the first level.

A one-character code that indicates whether the enumeration has continuously incrementing numbers or whether the numbering restarts at the completion of a specific unit. Use subfield ǂv with each level of enumeration except the first level.

Date of issuance of an index.

A one-character alphabetic code or a number that indicates the publication frequency of the item.

A one-character code that indicates whether a break in the enumeration and chronology contained in multiple 863-865 fields is due either to published issue(s) lacking in the collection or to unpublished parts or a lack of continuity in the enumeration and chronology of the parts.

One or more two- or four-character numeric codes that indicate the chronological point at which the next higher level increments or changes.

A note relating to all or part of the field that is in a form not intended for public display. A note which is intended for public display is contained in subfield ǂz.

Codes that describe the regularity of the publishing pattern codes in subfield ǂw.

A six-character code string designating the numbering schemes used on a publication. The codes allow for recording different numbering schemes at different levels of enumeration.

A note relating to all or part of the field that is in a form intended for public display. A note which is not intended for public display is contained in subfield ǂx.

MARC code that identifies the source of the abbreviations used in the captions of the field. See Caption Abbreviation Source Codes.

For information about subfield ǂ3, see Control Subfields.

For information about subfield ǂ8, see Control Subfields. Use subfield ǂ8 to propose a sequence for the relative order of display of the linked fields.

Subfield ǂ9 contains the tag of the holdings field embedded in field 891. The only valid contents are tags 853, 854, 855, 863, 864, and 865 which are defined in the MARC 21 format as:

• 853 - Captions and Pattern--Basic Bibliographic Unit
• 854 - Captions and Pattern--Supplementary Material
• 855 - Captions and Pattern--Indexes
• 863 - Enumeration and Chronology--Basic Bibliographic Unit
• 864 - Enumeration and Chronology--Supplementary Material
• 865 - Enumeration and Chronology--Indexes

Subfield ǂ9 is always the first subfield in the field. Indicator and subfield definitions are dependent on the field tag recorded in subfield ǂ9. All subfield code values have meaning only within the MARC field definition for the field tag recorded in subfield ǂ9.