Copyright 2000 OCLC
Worldwide Dewey
Models 11: UKOLN/mda Terminology Workshop
Diane Vizine-GoetzOCLC Online Computer Library Center
Copyright 2000 OCLC
Outline of talkOutline of talk
How the DDC is evolving to meet the present & future needs of worldwide users
Dewey in the Desire II project: the OCLC/NetLab collaboration
Enriching the content of the DDC database through vocabulary mapping projects
Copyright 2000 OCLC
How Dewey evolvesHow Dewey evolves
Restructuring in new editionsContinuous updatesMultilingual use
Copyright 2000 OCLC
New editionsNew editions
Restructuring To reflect new views and fields of
interestCitation order changed in life sciences
To remove biasReduction in Christian bias in religion
To provide for new topicsComputer science updated and expanded
Copyright 2000 OCLC
Continuous updatesContinuous updates
Biweekly New Library of Congress Subject Headings
(LCSH) mapped to DDC numbersMonthly
New and changed entriesAnnual electronic edition
Inclusion of frequently used synthesized numbers in Dewey for Windows and Dewey in CORC
Copyright 2000 OCLC
New and Changed Entries for December 1999New and Changed Entries for December 1999
The following new and changed entries are effective on December 1. Change is underlined.
Edition 21Changed entry:796.522 3 Rock climbing
Class sport and indoor rock climbing in 796.5224
New entry:796.522 4 Sport climbing
Class here indoor climbing
Copyright 2000 OCLC
New Library of Congress Subject Headings (LCSH) mapped to DDC numbersNew Library of Congress Subject Headings (LCSH) mapped to DDC numbers
LC Subject Headings (Weekly List 1999 no. 41) DDC 21 NumbersCelebrities in mass media 302.2308621Chocolate desserts 641.86Cornea--Laser surgery 617.719059Internet (Computer network)--Law and legislation 343.09944Internet literacy 004.678, 025.04LASIK (Eye surgery) 617.719059Libraries and poor children 027.625Methamphetamine abuse 362.299, 616.864Riker, William T. (Fictitious character) 791.4375, 791.4572Sabrina the Teenage Witch (Fictitious character) 791.4572Xena, Warrior Princess (Fictitious character) 791.4572
Inclusion of frequently used synthesized numbers in DFW and Dewey in CORCInclusion of frequently used synthesized numbers in DFW and Dewey in CORC
Copyright 2000 OCLC
Multilingual useMultilingual use
Worldwide use in WorldCat59 national bibliographies use Dewey,
including the BNBTranslations underway or under
discussion in 11 languagesTranslations often lead to expansions or
adaptations to address cultural needs not met by standard arrangement
Copyright 2000 OCLC
English/French/Spanish DDCEnglish/French/Spanish DDC
551.65Weather forecasts and reports for specific areas
551.65Prévisions et bulletinsmétéorologiques pour des régions
déterminées
551.65Pronósticos e informes del tiempo atmosférico para áreas especificas
Copyright 2000 OCLC
Dewey in the Desire II project: the OCLC/NetLab collaborationDewey in the Desire II project: the OCLC/NetLab collaboration
Why use Dewey -- traditional schemes such as the DDC have many features that make them powerful tools in the electronic environment: Well-defined categories Well-developed hierarchies Meaningful notation, and A rich network of relationships
Copyright 2000 OCLC
Further...Further...
Classification systems have rich potential as switching languages in the polyglot Web environment--the controlled vocabulary (the notation) remains the same when the concept descriptions and indexes appear in another language
Copyright 2000 OCLC
Engineering electronic library, Sweden (EELS)Engineering electronic library, Sweden (EELS)
DESIRE project partnerSubject-Based Information Gateway
Service contains ~1,400 Internet resources about engineering
The resources are selected according to agreed-upon quality criteria, intellectually described & assigned thesaurus terms and class codes from the Ei scheme
Copyright 2000 OCLC
"All" Engineering resources on the Internet"All" Engineering resources on the Internet
As a complement to EELS, the service provides access to 253,000 harvested engineering pages
The pages are searchable by full text and browsable by domain/country, title, most cited URL, and most-cited engineering file directories
Copyright 2000 OCLC
Common goalsCommon goals
To test the effectiveness of a universal scheme v.s. a subject specific scheme for organizing a large domain specific collection
To refine research methodologies for automated subject assignment
Copyright 2000 OCLC
Research questionsResearch questions
Should we employ universal schemes, subject specific systems, or both for domain specific collections?
How can reactive schemes deal with emerging topics?
What schemes provide effective bases for automated subject description?
Copyright 2000 OCLC
Some characteristics of Ei and Dewey (engineering)Some characteristics of Ei and Dewey (engineering)
Ei700 classification
categories16,000 terms
mapped to class structure
8,273 of these are preferred terms
DDC 2,210 classification
numbers 3,699 Dewey index
terms 587 intellectually
mapped terms 2,263 statistically
mapped terms Total = 6,549
Copyright 2000 OCLC
Automated classification in the DESIRE II projectAutomated classification in the DESIRE II project
Matched Ei terms to text in more than 132,000 harvested engineering pages
For matched terms, associated Ei classes are assigned to the documents
The matches are weighted based on term complexity, location of term in the
document, frequency
Copyright 2000 OCLC
NetLab ResultsNetLab Results
86,468 documents classifiedAbout 6 class codes assigned per
document57% percent class codes
automatically assigned to 923 EELS documents matched the intellectual classifications
Sample page for automated classificationSample page for automated classification
ResultsResults
Copyright 2000 OCLC
Automated classification with DDC using Scorpion Automated classification with DDC using Scorpion
Uses the DDC knowledge structure Enhanced with supplemental
terminologyEmploys an IR approach
Terms extracted from documents, formulated as a query, produces a ranked list of DDC classes
Copyright 2000 OCLC
Enhanced DDC database--Terms forSemiconductors (621.38152) Enhanced DDC database--Terms forSemiconductors (621.38152)
DDC Index Terms Crystal devices--
electronics Miniaturization--electronics Modules--electronics Optoelectronic devices Semiconductors Thin-film technology Wafers (Electronics)
Mapped Terms Quantum dots Amorphous semiconductors Compound semiconductors Electric contacts Ferroelectric thin films Gallium arsenide
semiconductors Hot carriers Ion implantation Lithography, Electron beam
Scorpion Classifier Scorpion Classifier
Scorpion results Scorpion results
Copyright 2000 OCLC
Next StepsNext Steps
Compare DDC intellectual & automated classifications for subset of EELS documents
Provide browsing access to document collection using both schemes
Map Ei & DDC class structures to enable cross-database browsing (EELS service to CORC, and the reverse)
Copyright 2000 OCLC
Enrich Dewey by linking to other knowledge organization schemesEnrich Dewey by linking to other knowledge organization schemes
Vocabulary Mapping Enhances vocabulary & terminology Expands the knowledge base Enables the construction of custom
views linked to or derived from the general scheme
Copyright 2000 OCLC
Vocabulary Mapping ProjectsVocabulary Mapping Projects
LCSH & LC Children's Subject Headings Medical Subject Headings (MeSH) A Women's Thesaurus Engineering Index Thesaurus (for research
purposes only) GEM subject terms ERIC Thesaurus (under discussion) Bioethics Thesaurus (under discussion)
Copyright 2000 OCLC
Associated Vocabulary ProfileAssociated Vocabulary Profile
Source of Term Strength ofAssociation
CORCTag
AssociationMethod
Editorially mapped LCSH Strong IM Intellectual
Subject Headingsfor Children
Strong/broadernumbers
SHC Intellectual
LCSH in NetFirst Moderate toStrong
NF Intellectual
OCLC WorldCat Moderate SM Statistical
DFW (from WorldCat) Weak FM Statistical
Copyright 2000 OCLC
Statistics for terms associated with core Dewey frameworkStatistics for terms associated with core Dewey framework
Term TypeDewey IndexIntellectually mapped (IM)Children's Headings (SHC)NetFirst (NF)Statistically Mapped(SM) Frequency Mapped (FM)Total
Count64,427
4,22015,201
6,97832,07552,104
175,005
Copyright 2000 OCLC
General Taxonomy ServiceGeneral Taxonomy Service
Descriptions of classes Brief (class number and caption); Medium (brief plus DDC index
terms); Full (all information associated with a DDC class) Custom relationships
Hierarchical; Interdisciplinary Associated Terminology
DDC Relative Index terms (Including terms from translated editions) Mapped Vocabularies (e.g., LCSH, MeSH, etc.
Other Services Class number updating; Class number decomposition Multilingual views based on translations of DDC Web site organizing tools (numbers and captions of 50,000 most
frequently used categories)
Copyright 2000 OCLC
LinksLinks
OCLC Office of Researchhttp://www.oclc.org/oclc/research/
Dewey Research Projectshttp://www.oclc.org/~vizine/Dewey_Research/
OCLC Forest Press - http://www.oclc.org/oclc/fp/index.htm
CORC - http://corc.oclc.org/
Engineering electronic library, Sweden (EELS) -
http://eels.lub.lu.se/
