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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.

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Presentation on theme: "Making Visible Hidden Relationships in the Dewey Decimal Classification: How Relative Index Terms Relate to DDC Classes 10 th International ISKO Conference."— Presentation transcript:

1 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

2 Example class Fencing Including bojutsu, kendo Class here sword fighting RI:Bojutsu Fencing (Swordplay) Kendo Sword fighting Swordplay

3 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

4 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

5 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

6 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

7 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)

8 Example Divinatory arts Including fortune-telling by bones, dice, pendulum Relative Index terms: Bonesdivination Dicedivination Pendulumsdivination

9 Standard subdivisions note 749 Furniture and accessories Standard subdivisions are added for furniture and accessories together, for furniture alone

10 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

11 Topic isolation Sign languages used primarily for purposes other than communication of deaf people Systems programs Operating systems Satellites and rings; eclipses, transits, occultations Religious experience, life, practice [cant parse reliably]

12 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

13 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

14 Matching RI terms to topics: EXACT match 121 Epistemology (Theory of knowledge) Certainty and probability Standard subdivisions are added for either or both topics in heading RI: Probabilitiesepistemology (AW)

15 Matching RI terms to topics: IN match 620 Engineering Irrigation Class here construction and use of irrigation canals RI: Irrigation canals engineering (AW)

16 Matching RI terms to topics: KEYWORD match *Activities and services Including Morse and other code telegraphy, printing telegraphy; stock tickers, teletype, telex; comprehensive works on facsimile transmission RI: Morse code telegraphy (SR)

17 Matching RI terms to topics: KEYWORD match *Satellite communication RI: Communications satellites (AW) *Radiobroadcasting Class here public broadcasting (noncommercial broadcasting), public aspects of amateur radio, interdisciplinary works on radiobroadcasting and television broadcasting RI: Noncommercial radio (AW)

18 Matching RI terms to topics: PARTIAL (50%+) match 748 Glass Methods of decoration RI: Decorative treatmentglass (AW)

19 Results EXACTINKEYWORDPARTIALTOTAL Approximates whole (24.4%) 4209 (9.0%) 1241 (2.7%) 5189 (11.2%) (47.2%) Standing room 3116 (6.7%) 4064 (8.7%) 952 (2.0%) 1513 (3.3%) 9645 (20.7%) Unknown status 1042 (2.2%) 1479 (3.2%) 584 (1.3%) 1091 (2.3%) 4196 (9.0%) Total (33.3%) 9752 (21.0%) 2777 (6.0%) 7793 (16.8%) (77.0%)

20 Future improvements (1) Observe hierarchical force 302Social interaction Class here... social psychology Content Including gossip, rumor RI: Rumorsocial psychology

21 Future improvements (2) Dont require match on Relative Index qualifier Systems of French origin Including Babouvism, Icarianism RI: Babouvism (Socialist school)

22 Future improvements (3) Introduce stopwords for general terms 748 Glass Methods of decoration RI: Decorative treatmentglass (AW)

23 Future improvements (4) Locally reverse treatment of main heading and subheading 220The Bible 224 Prophetic books of Old Testament Isaiah (Isaias) RI: Bible. O.T.--Isaiah


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