MARC 21 Concise Classification: Valid Number Tracing Fields (5XX)

This is an ARCHIVED VERSION of the 2001 electronic edition of the MARC 21 Concise Formats. Please see
www.loc.gov/marc/concise/ for the most up-to-date version of the electronic MARC 21 Concise Formats.

Fields in this group are used to trace references from one valid classification number to another. In the MARC 21 classification format, only one Valid Number Tracing field is currently defined.

• 553 - VALID NUMBER TRACING (R)

Information for Translators and Other Users
Items highlighted in red indicate changes made after the 2000 edition of the MARC 21 Concise Formats was published and are included in the 2001 printed edition of the MARC 21 Concise Formats.

553 - VALID NUMBER TRACING (R)

A tracing for a cross reference from one valid classification number to another valid classification number. If the classification number in the tracing is valid for some topics but invalid for others, this field is used, and the topics that refer to another number are specified in subfield $t (Topic).

Indicators

• First - Source of classification number
  • 0 - Schedule
  • 1 - Table
• Second - Undefined
  • # - Undefined

Subfield Codes

• $a - Classification number--single number or beginning number of span (R)
• $c - Classification number--ending number of span (R)
• $h - Caption hierarchy (R)
  A caption for each higher level of the caption hierarchy that precedes the caption for a classification number or span that is contained in subfield $j (Caption). The caption at the highest level is recorded in the first subfield $h. The caption at each successive level is recorded in sequence in separate subfields $h up to and including the level that precedes the caption contained in subfield $j. Captions for all levels of the hierarchy are recorded in the field. If the caption in subfield $j is the highest level of the hierarchy, subfield $h is not used. (However, some systems may wish to omit some levels of the hierarchy for display purposes.) A caption hierarchy for classification numbers in a summary number span in the Dewey Decimal Classification is contained in subfield $k (Summary number span caption hierarchy).
• $i - Reference instruction phrase (NR) See Tracings and References
• $j - Caption (NR)
  The lowest caption in the caption hierarchy for a classification number or span.
• $k - Summary number span caption hierarchy (R)
  The caption at a level higher than the last for a summary number span when the classification scheme identified in field 084 (Classification Scheme and Edition) is the Dewey Decimal Classification. Caption hierarchies for single classification numbers, defined numbers spans, or other types of summary number spans are contained in subfield $h. The last caption in the caption hierarchy for a summary number span in field 153 (008/07, Type of number, code c for summary number span) is recorded in subfield $j.
• $t - Topic (NR)
  The topic to which the tracing applies.
• $w - Control subfield (NR) See Tracings and References
  • 0 Special relationship
  • 1 Hierarchical relationship
  • 2 Reference display
  • 3 History reference
• $z - Table identification (NR)
  The identification of the table to which the classification number belongs. The identification of the table by which a classification number or span is further subarranged is contained in field 762 (Table Identification). Subfield $z is input before the first element of the classification number in the first subfield $a.
• $6 - Linkage (NR) See Control Subfields
• $8 - Field link and sequence number (R) See Control Subfields

Examples

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