View
219
Download
0
Category
Tags:
Preview:
Citation preview
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.
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.
The world’s libraries. Connected.
Cataloging Process
The world’s libraries. Connected.
Search
The world’s libraries. Connected.
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.
The world’s libraries. Connected.
Indirect Searching
The world’s libraries. Connected.
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.
The world’s libraries. Connected.
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.
The world’s libraries. Connected.
Sailboats
Keyword Search
The world’s libraries. Connected.
Sailboats
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
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.
The world’s libraries. Connected.
Cataloguing
Full Heading Search
The world’s libraries. Connected.
Full heading Searches
The world’s libraries. Connected.
The world’s libraries. Connected.
Education, higher
Subfield Search
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
Philosophy
Related Term Search
The world’s libraries. Connected.
The world’s libraries. Connected.
Boolean Operators
Boolean operators AND, OR, and NOT are supported in keyword searches.
The world’s libraries. Connected.
Cats OR Dogs
Boolean Search
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
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.
The world’s libraries. Connected.
e-er [Estonia]
GAC Search
The world’s libraries. Connected.
feature:lake
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
The world’s libraries. Connected.
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.
The world’s libraries. Connected.
Questions?
ONEILL@OCLC.ORG
Try it http://fast.oclc.org/searchfast/
Recommended