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Music OCLC Users Group Annual Meeting San Jose, California 2013 February 27. Jay Weitz. Senior Consulting Database Specialist WorldCat Quality Management Division OCLC. Plenary Session: WorldCat Local Panel. Reintroducing GLIMIR. Reintroducing GLIMIR: Definition and Objectives.

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Reintroducing GLIMIR

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Music OCLC Users Group Annual Meeting

San Jose, California2013 February 27

Jay Weitz

Senior Consulting Database Specialist

WorldCat Quality Management Division

OCLC

Plenary Session: WorldCat Local Panel

ReintroducingGLIMIR


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.


Reintroducing GLIMIR: Relation to FRBR and DDR

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.

FRBR algorithm:

  • Works in real time.

  • Makes author/title key.

  • Creates work clusters.

  • Assigns the OCLC Work Identifier (OWI).


Reintroducing GLIMIR:Diagram of Metadata and Identifier Structure

  • Identifiers at all levels

  • Holdings at all levels

  • Metadata summaries at higher levels


Reintroducing GLIMIR: Before

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: After

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: Perceived Duplicates

  • 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: De-Duplication

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

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: Music and Film

  • “Cast list.”

  • Dates.

  • Scores, Parts, Scores and Parts.


Reintroducing GLIMIR:Show GLIMIR Search Results


Reintroducing GLIMIR:Show All GLIMIR Cluster Records


Reintroducing GLIMIR:Search Without GLIMIR Option


Reintroducing GLIMIR:Same Search with GLIMIR Option Selected


Reintroducing GLIMIR: GLIMIR Cluster


Reintroducing GLIMIR: Cluster HoldingsInformation Displays on Each Bibliographic Record


Reintroducing GLIMIR: Acknowledgements

  • Robert Bremer

  • Ted Fons

  • Janifer Gatenby

  • Richard O. Greene

  • Ying Li

  • W. Michael Oskins

  • Patricia Schuette Sexton

  • Gail Thornburg

  • Kelly Womble


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