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Making Visible Hidden Relationships in the Dewey Decimal Classification: How Relative Index Terms Relate to DDC Classe

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Making Visible Hidden Relationships in the Dewey Decimal Classification: How Relative Index Terms Relate to DDC Classes. 10 th International ISKO Conference August 6, 2008 Rebecca Green Assistant Editor Dewey Decimal Classification. Example class. 796.86 Fencing

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Making Visible Hidden Relationships in the Dewey Decimal Classification: How Relative Index Terms Relate to DDC Classes

10th International ISKO Conference

August 6, 2008

Rebecca Green

Assistant Editor

Dewey Decimal Classification

example class
Example class
  • 796.86 Fencing
  • Including bojutsu, kendo
  • Class here sword fighting
  • RI: Bojutsu
  • Fencing (Swordplay)
  • Kendo
  • Sword fighting
  • Swordplay
ddc classes
DDC classes
  • Class as gathering point for set of topics
  • Caption
  • Including concepts
  • Class here concepts
  • Topics either equal / approximate whole of class or are in standing room in class
topics in classes
Topics in classes
  • Approximating the whole vs. standing room:
  • Standard subdivisions can only be added for topics that approximate the whole of the class, not for those in standing room
  • Future expansion anticipated for topics in standing room, not for those that approximate the whole
  • Topics in class-here notes approximate the whole of the class; topics in including notes are in standing room
relative index terms and class topics
Relative Index terms and class topics
  • Explicitly: Relative Index terms index class as whole
  • Implicitly: Relative Index terms associated with specific topics in class
  • Specific associations not recorded
  • Thus, unknown if Relative Index term topic approximates the whole of the class or is in standing room there
  • Project attempts to make this designation automatically
motivation
Motivation
  • Correct decision on addition of standard subdivisions
  • Maintenance of scheme: If topic moves to another class, associated Relative Index term should, too
  • Support automated operations on scheme, e.g., creation of derived versions
difficulties
Difficulties
  • Identification of topics
  • Topics in caption
  • In multitopic caption, topics may approximate whole or be in standing room
  • Paraphrase relationship between topics in schedules and Relative Index terms (morphological, syntactic, semantic)
example
Example
  • 133.3 Divinatory arts
  • Including fortune-telling by bones, dice, pendulum
  • Relative Index terms:
  • Bones—divination
  • Dice—divination
  • Pendulums—divination
standard subdivisions note
Standard subdivisions note
  • 749 Furniture and accessories

Standard subdivisions are added for furniture and accessories together, for furniture alone

two phase approach
Two-phase approach
  • In schedules

Isolate topics

Determine if topics equal / approximate whole of class (AW) or are in standing room (SR)

  • Match Relative Index terms to schedule topics, using series of increasingly more relaxed strategies
topic isolation
Topic isolation
  • Sign languages used primarily for purposes other than communication of deaf people
  • Systems programsOperating systems
  • Satellites and rings; eclipses, transits, occultations
  • Religious experience, life, practice [can’t parse reliably]
approximates the whole topics
Approximates-the-whole topics
  • All topics in class-here note
  • Topic in single topic caption
  • Topic in multitopic caption, with note that standard subdivisions are added for:

Any or all topics in heading

Either or both topics in heading

The specific topic alone

standing room topics
Standing room topics
  • All topics in including notes
  • Topic in multitopic caption, with note for adding standard subdivisions, not meeting criteria for approximating the whole
  • Topic in multitopic caption, without note for adding standard subdivisions, that matches topic in subordinate caption
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Matching RI terms to topics:EXACT match

121 Epistemology (Theory of knowledge)

121.63      Certainty and probability

Standard subdivisions are added for either or both topics in heading

RI: Probabilities—epistemology (AW)

matching ri terms to topics in match
Matching RI terms to topics:IN match
  • 620 Engineering
  • 627.52      Irrigation
  • Class here construction and use of irrigation canals
  • RI: Irrigationcanals—engineering(AW)
matching ri terms to topics keyword match
Matching RI terms to topics:KEYWORD match
  • 384.14      *Activities and services
  • Including Morse and other code telegraphy, printing telegraphy; stock tickers, teletype, telex; comprehensive works on facsimile transmission
  • RI: Morsecode telegraphy (SR)
matching ri terms to topics keyword match17
Matching RI terms to topics:KEYWORD match
  • 384.51      *Satellitecommunication
  • RI: Communicationssatellites (AW)
  • 384.54      *Radiobroadcasting
  • Class here public broadcasting (noncommercial broadcasting), public aspects of amateur radio, interdisciplinary works on radiobroadcasting and television broadcasting
  • RI: Noncommercialradio(AW)
matching ri terms to topics partial 50 match
Matching RI terms to topics:PARTIAL (50%+) match
  • 748    Glass
  • 748.6      Methods of decoration
  • RI: Decorative treatment—glass(AW)
future improvements 1
Future improvements (1)
  • Observe hierarchical force
  • 302 Social interaction
  • Class here . . . social psychology
  • 302.24 Content
  • Including gossip, rumor
  • RI: Rumor—social psychology
future improvements 2
Future improvements (2)
  • Don’t require match on Relative Index qualifier
  • 335.2 Systems of French origin
  • Including Babouvism, Icarianism
  • RI: Babouvism (Socialist school)
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Future improvements (3)
  • Introduce stopwords for general terms
  • 748    Glass
  • 748.6      Methods of decoration
  • RI: Decorative treatment—glass(AW)
future improvements 4
Future improvements (4)
  • Locally reverse treatment of main heading and subheading
  • 220 The Bible
  • 224 Prophetic books of Old Testament
  • 224.1 Isaiah (Isaias)
  • RI: Bible. O.T.--Isaiah
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