The world’s libraries. Connected. Reintroducing GLIMIR Plenary Session: WorldCat Local Panel Music OCLC Users Group Annual Meeting San Jose, California.

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Presentation transcript:

The world’s libraries. Connected. Reintroducing GLIMIR Plenary Session: WorldCat Local Panel Music OCLC Users Group Annual Meeting San Jose, California 2013 February 27 Jay Weitz Senior Consulting Database Specialist WorldCat Quality Management Division OCLC

The world’s libraries. Connected. 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.

The world’s libraries. Connected. 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

The world’s libraries. Connected. Reintroducing GLIMIR: Diagram of Metadata and Identifier Structure Identifiers at all levels Holdings at all levels Metadata summaries at higher levels

The world’s libraries. Connected. 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

The world’s libraries. Connected. 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

The world’s libraries. Connected. 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 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

The world’s libraries. Connected. 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

The world’s libraries. Connected. 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 = 8 o = 22 cm = 8 in.) Normalizing titles. Reintroducing GLIMIR: De-Duplication

The world’s libraries. Connected. “Cast list.” Dates. Scores, Parts, Scores and Parts. Reintroducing GLIMIR: Music and Film

The world’s libraries. Connected. Reintroducing GLIMIR: Show GLIMIR Search Results

The world’s libraries. Connected. Reintroducing GLIMIR: Show All GLIMIR Cluster Records

The world’s libraries. Connected. Reintroducing GLIMIR: Search Without GLIMIR Option

The world’s libraries. Connected. Reintroducing GLIMIR: Same Search with GLIMIR Option Selected

The world’s libraries. Connected. Reintroducing GLIMIR: GLIMIR Cluster

The world’s libraries. Connected. Reintroducing GLIMIR: Cluster Holdings Information Displays on Each Bibliographic Record

The world’s libraries. Connected. Robert Bremer Ted Fons Janifer Gatenby Richard O. Greene Ying Li W. Michael Oskins Patricia Schuette Sexton Gail Thornburg Kelly Womble Reintroducing GLIMIR: Acknowledgements