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The world’s libraries. Connected. Using Authorities to Improve Subject Searches Beyond Libraries – Subject Metadata in the Digital Environment and Semantic Web, 17-18 August 2012, National Library of Estonia, Tallinn Edward T. O’Neill, Rick Bennett & Kerre Kammerer OCLC Research

The world’s libraries. Connected. Using Authorities to Improve Subject Searches Beyond Libraries – Subject Metadata in the Digital Environment and Semantic

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Page 1: The world’s libraries. Connected. Using Authorities to Improve Subject Searches Beyond Libraries – Subject Metadata in the Digital Environment and Semantic

The world’s libraries. Connected.

Using Authorities to Improve Subject Searches

Beyond Libraries – Subject Metadata in the Digital Environment and Semantic Web, 17-18 August 2012, National Library of Estonia, Tallinn

Edward T. O’Neill,Rick Bennett & Kerre Kammerer

OCLC Research

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The world’s libraries. Connected.

Authorities

• Are primarily a cataloger’s tool.• Improve quality and consistency.• Include valuable information and entry

points.• Are under utilized in the search process. • Role in the semantic web will be limited

unless re-envisioned.

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The world’s libraries. Connected.

Cataloging Process

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The world’s libraries. Connected.

Search

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Two Step Indirect Search

1. The authority file is first searched to find the appropriate subject heading.

2. The bibliographic file is then searched to identify the resources with the subject heading.

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Indirect Searching

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searchFAST

• Is a prototype that uses an authority file as the source of subject headings rather than the headings from bibliographic records.

• Uses the FAST subject headings.

• Uses the WorldCat.org bibliographic records.

• Complements other access methods.

• Is freely available at http://fast.oclc.org/searchfast.

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FAST

• Faceted Application of Subject Terminology,

• Is a faceted subject heading schema derived from the Library of Congress Subject Headings (LCSH).

• Was developed by OCLC in cooperation with the Library of Congress.

• Establishes all headings.

• Supports the generation of search trees.

• Is available as linked data.

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Sailboats

Keyword Search

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Sailboats

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searchFAST Phase Indexes

In addition to the keyword index, searchFAST supports four phrase indexes:

•Heading index.•Subfield index. •Source heading index.•See also reference index.

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Cataloguing

Full Heading Search

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Full heading Searches

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Education, higher

Subfield Search

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Philosophy

Related Term Search

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Boolean Operators

Boolean operators AND, OR, and NOT are supported in keyword searches.

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Cats OR Dogs

Boolean Search

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Special Geographic Searches

Most FAST authority records for geographic names—and those for many event records—include a geographic area code (GAC):

• e-er, for example, is the GAC for Estonia. • GACs can be used as keywords.• GACs must be prefixed with gac: such as gac:e-er. • Keywords can be added to GAC queries to refine the

search. • Feature types can also be added to limit the search but

must be prefixed with feature: such as feature:lake.

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e-er [Estonia]

GAC Search

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feature:lake

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Conclusions

The searchFAST prototype:

• Demonstrates the effectiveness and practicality of using an authority file in searching.

• Leverages authority work to benefit searchers as well catalogers.

• Generates search trees that are easy to navigate.• Simple keyword searches generally produce very

satisfactory results.• Supports sophisticated searches.

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Questions?

[email protected]

Try it http://fast.oclc.org/searchfast/