Music OCLC Users Group Annual Meeting
San Jose, California
2013 February 27
Plenary Session: WorldCat Local Panel
Reintroducing
GLIMIR
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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Reintroducing GLIMIR: Relation to FRBR and DDR
FRBR algorithm:
• Works in real time.
Duplicate Detection and
Resolution (DDR):
• Makes author/title key.
• Works as an offline process.
• Creates work clusters.
• Launches queries to find
candidate duplicates.
• Assigns the OCLC Work
Identifier (OWI).
• Resolution program determines
“retained” record.
• GLIMIR adapts DDR algorithms,
creates clusters and identifiers.
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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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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.
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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.
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Reintroducing GLIMIR: Perceived Duplicates
• Perception of duplicate problem in
WorldCat has worsened as more nonEnglish 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.
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Reintroducing GLIMIR: De-Duplication
GLIMIR complements deduplication:
• 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.
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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.
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Reintroducing GLIMIR: Music and Film
• “Cast
list.”
• Dates.
• Scores,
Parts,
Scores
and
Parts.
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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 Holdings
Information Displays on Each Bibliographic Record
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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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