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Thesaurus of Graphic Materials

Here’s the good news.

There are a lot of Search Terms…

The TATE has used a relatively expansive list of subjects to organize a prominent subject search capability for all the  works in its online collection.  According to the site there are 66,062 works of art by 3,075 artists in the collection, “every work in the Collection has its own online information page,” and “the majority are illustrated, though this is not always possible due to copyright restrictions.”

Main Subject List.  The Tate.

Main Subject List. The Tate.

The Terms Organized Hierarchically

The subject search option is prominently displayed on the home page of the collection along with the simple and advances search options.   In addition to a standard text search box, the subjects are presented an expandable list of 16 main categories, as shown on the left, for browsing.  There  are (by my count, which could be off) 155 second level subcategories.   Each of these subcategories is further divided into between 2 and 100 or more subcategories of its own.  There are too many for me to count all of them, and unfortunately the TATE does not choose to allow you to peruse them in alternate ways.   It is hard to estimate the total because the range is so great.  The main category Abstraction, for instance, has a total of only 10 ultimate sub-categories, whereas Architecture has 326 (ranging from Abbey to Zoo.)  Under the main category People, however, there are  1068 names in the single third level  subcategory of portraits:male. I can’t even make a guess as to the total number when these proper names are taken into account.  A conservatively estimate of general subject categories is 4,000 or so. It is evident that the Tate has created a pretty substantial subject matter breakdown. [click to continue…]

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Tematres partial expansion of Thesaurus of Graphic Materials (Activities)

Tematres partial expansion of Thesaurus of Graphic Materials (Activities)

The image to the right is a screenshot of a partially expanded, but truncated (”A” to “D”), hierarchy of the first (of 26) main subdivisions of the Thesaurus of Graphic Materials (TGM), a controlled vocabulary for “indexing visual materials by subject and by genre/format.”‘   The subdivision is entitled  ” Subject Terms Activities”.  The image shows only the portion between  A to the very beginning of D.  This screenshot is not from official site of The Thesaurus for Graphic Materials (TGM), which is maintained under the aegis of the Library of Congress, as one might expect, because that version is  user unfriendly in the extreme. Rather it is from a free vocabulary site, TemaTres Vocabulary Server which is much easier to navigate.  That’s why it’s here, to give a meaningful sense of the TGM’s scope and contents.

As described on the official site:

“The Thesaurus for Graphic Materials is a tool for indexing visual materials by subject and by genre/format. The thesaurus includes more than 7,000 subject terms and 650 genre/format terms to index types of photographs, prints, design drawings, ephemera, and other pictures. In 2007, the subject and genre/format vocabularies, previously maintained separately, were merged into a single list and migrated to new software, MultiTes.  Other minor changes are clarified in the links below. For questions about the thesaurus, contact TGM editors at: tgmed@loc.gov.”

In the overview of the TGM in the Tematres site the TGM is said to contain 11,893 terms, 13,262 relations between terms, and 5,230 non-preferred terms.

The merger of the subject and genre/format terms in a single thesaurus simplifies things in some respects but    [click to continue…]

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