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ReintroducingGLIMIR

Plenary Session: WorldCat Local Panel

Music OCLC Users Group Annual Meeting

San Jose, California2013 February 27

Jay Weitz

Senior Consulting Database Specialist

WorldCat Quality Management Division

OCLC

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Reintroducing GLIMIR: Definition and Objectives

GLIMIR = Global LIbrary Manifestation IdentifieR• To identify records describing the same manifestation: Manifestation Clusters.

• Parallel records: Same resource with same content in same format, but described in different languages of cataloging.

• Create OCLC Manifestation Identifiers (OMI) and index them in WorldCat.

• To identify records describing different manifestations with the same content: Content Clusters.

• Originals, reprints, microform reproductions, digital reproductions.

• Create OCLC Content Identifiers (OCI) and index them in WorldCat.

• To improve FRBR work sets by merging those containing records that GLIMIR assesses to be equal in content.

• Informing FRBR of algorithm improvements.

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FRBR algorithm:• Works in real time.

• Makes author/title key.

• Creates work clusters.

• Assigns the OCLC Work Identifier (OWI).

Duplicate Detection and Resolution (DDR):

• Works as an offline process.

• Launches queries to find candidate duplicates.

• Resolution program determines “retained” record.

• GLIMIR adapts DDR algorithms, creates clusters and identifiers.

Reintroducing GLIMIR: Relation to FRBR and DDR

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Reintroducing GLIMIR:Diagram of Metadata and Identifier Structure

•Identifiers at all levels

•Holdings at all levels

•Metadata summaries at higher levels

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Worldcat.org: Before GLIMIR: Multiple Works,

Scattered Holdings• Retrieves and displays one

representative record per work set.

• Currently there may be multiple work sets for the same work (particularly for works without clear authors).

• Depending on the search, these records may be scattered in large result sets.

Reintroducing GLIMIR: Before

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Worldcat.org: After GLIMIR: One Work,

Consolidated Holdings• Consolidated work set (more

likely to get a thumbnail image).

• Includes translations.

• Briefer short lists, more complete retrieval.

Reintroducing GLIMIR: After

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• Perception of duplicate problem in WorldCat has worsened as more non-English language of cataloging records are loaded and parallel records are added.

• Holdings scatter.

• DDR has deleted nearly 13 million records since 1992.

• Perception of duplicates in WorldCat remains.

• GLIMIR OMI should have a bigger impact on perceived duplication.

• Importance of good work groups.

Reintroducing GLIMIR: Perceived Duplicates

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GLIMIR complements de-duplication:

• Hides records that are duplicates but cannot be de-duplicated (styles/rules too different, sparse records).

• Surfaces holdings, hides less desired descriptions.

• Gives more accurate count of the numbers of manifestations in WorldCat.

Reintroducing GLIMIR: De-Duplication

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Just as with FRBR, improvements to general matching have been identified:

• Typo tolerance in pagination.

• Improvements to lists of noise titles.

• Improved language and transliteration sensitivity.

• Interpretation of size (e.g. gr8 = octavo = 8o = 22 cm = 8 in.)

• Normalizing titles.

Reintroducing GLIMIR: De-Duplication

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• “Cast list.”

• Dates.

• Scores, Parts, Scores and Parts.

Reintroducing GLIMIR: Music and Film

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Reintroducing GLIMIR:Show GLIMIR Search Results

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Reintroducing GLIMIR:Show All GLIMIR Cluster Records

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Reintroducing GLIMIR:Search Without GLIMIR Option

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Reintroducing GLIMIR:Same Search with GLIMIR Option Selected

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Reintroducing GLIMIR: GLIMIR Cluster

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Reintroducing GLIMIR: Cluster HoldingsInformation Displays on Each Bibliographic Record

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•Robert Bremer

•Ted Fons

•Janifer Gatenby

•Richard O. Greene

•Ying Li

•W. Michael Oskins

•Patricia Schuette Sexton

•Gail Thornburg

•Kelly Womble

Reintroducing GLIMIR: Acknowledgements