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Rules and StructuresTable of Contents:Tags Divided by HundredsThere are some general rules that help define what all the numbers used as field tags mean. The basic divisions of the MARC 21 bibliographic record are:
The 9XXs are left for locally-defined uses, such as local barcode numbers, locations, and other types of local information. The notation XX is used to refer to a group of related tags. For example, 1XX refers to all the tags in the 100s: 100, 110, 130, and so on.
2XX refers to all the tags in the 200s. This group of tags contains the title of the item described in the bibliographic record and all of the variant titles that also apply to the item. 210 Abbreviated title222 Key title 240 Uniform title 242 Translation of title by cataloging agency 243 Collective uniform title 245 Title statement 246 Varying form of title 247 Former title or title variations Access PointsAccess points (a main entry, subject added entries, and other added entries) are an important part of the bibliographic record to retrieve an item. In the traditional card catalog, separate cards were created for the headings, known as access points, which a patron or librarian today would choose to search in an on-line catalog.Most of the access points are in:
These are the fields that are under authority control. Authority control means following a standard or established form. To learn more about authority control, see Understanding MARC Bibliographic: Machine-Readable Cataloging Parallel ContentThe fields requiring authority control are also the fields that use parallel tag construction. In 1XX, 4XX, 6XX, 7XX and 8XX fields, the last two digits of the tag are 00 for a personal name heading. Therefore, for a main entry (1XX) that is a personal name (X00), the correct tag is 100. For a subject heading (6XX) that is a personal name, the tag is 600. An added entry (7XX) for a joint author, which is also a personal name, the tag is 700.This parallel content can be summarized as follows:
By combining the charts, it becomes evident that if, for example, the subject of a book (6XX) is a personal name, the tag will be 600; if the subject of the book is a corporate name, the tag will be 610; if the subject of the book is a topical term, the tag will be 650; if the subject of a book is a geographic name, the tag will be 651.
The Fixed Field 008Now, we come to the last topic of our Tutorial : The 008 field. It is also referred to as Fixed-Length Data Elements, or Fixed Field. This field contains 40 character positions that provide coded bibliographic information, and precedes the main bibliographic part of a MARC record (the variable fields). The display of fixed field might differ from system to system. Below is an example of fixed field for book format from an OCLC MARC record:
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