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Terminology… T


See MARC Tag ; See also Tagging

Tag Flips

MARS 2.0 programs flips certain fields between each other during the authority matching process. Sometimes bibliographic records have been generated with information appearing in the wrong field. With Tag Flipping turned on, these fields can be set to match against different tags regardless of the information within the original field: An example of this as follows: (mpg)

Bibliographic Heading:

650    0$aItaly (Rome)
650    0$aEuropean Union.

Match as tag (flip)

651   0$aItaly (Rome)
610  20$aEuropean Union.


Tagging is the process of assigning terms to a web server or blog server to define content and purpose of that web/blog. A human reader can usually tell the purpose of the page by quickly scanning the list of tags. Typically, the server displays the tags in a list on that page, with each tag displayed as a web link leading to an index page listing all web pages that use the tag. This allows a reader to locate quickly all pages which have been associated with the term. A tag is a non-hierarchical keyword or term assigned to a piece of information (such as an internet bookmark, digital image, or computer file). This kind of metadata helps describe an item and allows it to be found again by browsing or searching. Tags are chosen informally and personally by the item’s creator or by its viewer, depending on the system. On a website in which many users tag many items, this collection of tags becomes a folksonomy. (wp)

Taxonomic Classification

Traditional hierarchical structure currently found in Authority control. Taxonomies, or taxonomic schemes, are composed of taxonomic units known as taxa (singular taxon), or kinds of things that are arranged frequently in a hierarchical structure. Typically they are related by subtype-supertype relationships, also called parent-child relationships. In such a subtype-supertype relationship the subtype kind of thing has by definition the same constraints as the supertype kind of thing plus one or more additional constraints. For example, car is a subtype of vehicle. So any car is also a vehicle, but not every vehicle is a car. Therefore, a thing needs to satisfy more constraints to be a car than to be a vehicle. (wp)


In information technology, a thesaurus represents a database or list of semantically orthogonal topical search keys. Thesaurus databases, created by international standards, are generally arranged hierarchically by themes and topics. A list of every important term (single-word or multi-word) in a given domain of knowledge; and a set of related terms for each term in the list. (wp)

Title Statement

Title Statement field consists of the title proper and may also contain the general material designation (medium), remainder of title, other title information, the remainder of the title page transcription, and statement(s) of responsibility. The title proper includes the short title and alternative title, the numerical designation of a part/section and the name of a part/section. The title statement is not under authority control. (m21)

TOC – Table of Content Enrichment

An automated process that populates the bibliographic record with table of content information. The USMARC 505$a field is typically where the TOC data is added. is added. It can also be added in a locally defined field. Table of Contents Enrichment Services, contains imprints dating back to 1991. Contents of 40,000 titles are added each year. Titles purchased by academic, special and public libraries are included in their database. In addition to Table of Contents, Title Summaries from dust jackets and Author Affiliation Information can be added to your records. (mpg)

Topical Heading

A type of subject heading that expresses what a work is about. (lcshpa)

Topical Subdivision

A type of subject heading subdivision that appears in an $x subfield of the 6XX field and that designates a specific aspect, or subtopic, of the main heading other than period, place, or form. (lcshpa)

Topical Subject Headings

MARC field that contains a topical term that describes what the material being described is about. The appropriate tag for Topical Subject Heading is the 650 tag. Indicator 2 of the tag indicates the source of the subject heading. A subdivision which represents an aspect of the main subject other than form, place, or period. (ac, google)

Trace All

A special MARS 2.0 series processing option is provided for libraries that need to have all series headings recorded in 8XX fields, often due to local system indexing requirements. In the MARS 2.0 Trace All series processing option: (mpg)

  • Field 800/810/811 Series Added Entry is created for each pre-AACR2 field 400/410/411 (Series Statement/Added Entry)
  • Field 830 (Series Added Entry) is created for each field 440 (Series Statement/Added Entry)
  • Field 830 (Series Added Entry) is created for each field 490-0 (Series Statement, Series Not Traced)
  • Field 830 (Series Added Entry) is created for each field 490-1 (Series Statement, Series Traced Differently) when the bibliographic record does not contain field 8XX (Series Added Entry)


A series added entry (8XX) is made on the record for each work in a series if it is judged to be a useful access point. When an added entry for a series is made, we say that the series is "traced." The traced record can be found by performing a search for the series as a title search in the OPAC. Series are treated as traced if an LC authority record contains field 645 $a coded "t" OR 008[12] = ’a’ or ’b’ (m21, mpg)

Tracing Fields

Tracing fields lead directly from one heading to a single other heading. A 4XX (See From Tracing) field leads from an unauthorized heading to an authorized heading. A 5XX see also from tracing field leads from one authorized heading to another authorized heading. The 4XX and 5XX fields are used only in established heading records and subdivision records. (m21)

Type of Jurisdiction Qualifier

A term (enclosed in parentheses) indicating type of the same name, for example, Washington (State). (lcshpa)

Typographical Errors

A typographical error or typo is a mistake made during, originally, the manual type-setting (typography) of printed material, or more recently, the typing process. The term includes errors due to mechanical failure or slips of the hand or finger, but excludes errors of ignorance. Most typos involve simple duplication, omission, transposition, or substitution of a small number of characters. Though the term "typo" excludes errors of ignorance, it is common to find it used as a euphemism to describe instances of poor spelling, punctuation, or grammar. (wp)