Heading Usage in Authority Records (Introduction)
The MARC 21 Format for Authority Data identifies three categories of heading usage in records: main or added entry (008/14); subject added entry (008/15); and series added entry (008/16). Only established headings may be used as the lead element of access points in bibliographic records. Name, name/title, and uniform title established headings may be appropriately used as any one, two, or three of the 008/14-16 usage categories. Topical term and extended subject headings may be used only as subject added entries. Subdivision headings may be used only in extended subject heading added entries.
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