Would an Explicit Versioning of the DDC Bring Advantages for Retrieval?

1

Would an Explicit Versioning of the DDC Bring Advantages for Retrieval?

Claudia Effenberger, Julia Hauser

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

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The DDC is constantly changing

726 Buildings for religious and related purpose726.7 Monastic buildings

726.79 Parts and accessory structures Including cells, cloisters, refectories

726.796 CloistersClass here comprehensive works on cloisters [formerly 726.69]

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

PICA 3

3000 Legler, Rolf4000 Mittelalterliche Kreuzgänge in Europa5400 [DDC22ger]726.79

3000 Legler, Rolf4000 Mittelalterliche Kreuzgänge in Europa5400 [DDC22ger]726.796

New subordinated class

It is not possible to review the correctness of DDC notations

3 | 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

4

The modifications can lead to incomplete search results

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

5

In spite of the modification thesearch result should be correct

!

?? ?

ddc=726.79* ?

? ?

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

6

We create identifiers for each version of the DDC classes and a Semantic Network for searching

Title

TitleTitle

skos:closeMatch[2010-06-16]

skos:broaderskos:narrower

dct:isReplacedBy

dc:subject

dc:subject

dc:subjectskos:broadMatch[2007-01-01] {2010-06-16}

dc:subject

dct:replaces

Title

Title

dc:subject

dc:subject

DDC class identifier DDC class identifier

DDC class identifier Subject Heading

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

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Each version of a DDC class getsa unique identifier

http://dewey/info/class/726.796/2009/03/30/

726.796Cloisters

Class here comprehensive works on cloisters [formerly 726.69]

[2009-03-30]

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

8

Through the identifier we can differentiate between the versions

http://dewey/info/class/726.79/2005/11/02/

http://dewey/info/class/726.79/2009/03/30/

http://dewey/info/class/726.796/2009/03/30/

726.796Cloisters

Class here comprehensive works on cloisters [formerly 726.69]

[2009-03-30]

726.79Parts and accessory structures

Including cells, refectories[2009-03-30]

726.79Parts and accessory structures

Including cells, cloisters, refectories [2005-11-02]

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

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Because of the versioning we can identify the meaning of a DDC class

Die singenden Steine von Moissac [2010-03]

Mittelalterliche Kreuzgänge in Europa [2008-02]

Infirmarien – Kranken- und Sterbehäuser der Mönche [2010-02]

http://dewey/info/class/726.79/2005/11/02/

http://dewey/info/class/726.79/2009/03/30/

http://dewey/info/class/726.796/2009/03/30/

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

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We have to save the version of a DDC class in the descriptive entry

3010 Straub, Rainer4000 Die singenden Steine von Moissac5400 [DDC22ger]726.7960944755401 726.796[2009-03-30]

PICA 3

3010 Legler, Rolf4000 Mittelalterliche Kreuzgänge in Europa5400 [DDC22ger]726.795401 726.79[2005-11-02]{2009-03-30}

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

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We model the relations as a Semantic Network

Infirmarien – Kranken- und Sterbehäuser der Mönche [2010-02]

Mittelalterliche Kreuzgänge in Europa [2008-02]Die singenden Steine von Moissac [2010-03]

skos:closeMatch[2010-06-16]

skos:broaderskos:narrower

dct:isReplacedBy

dc:subject

dc:subject

dc:subjectskos:broadMatch[2007-01-01] {2010-06-16}

dc:subject

dct:replaces

Kloster Wedinghausen – Westflügel [2008-03]

Der Kreuzgang der Abtei Altenryf

[2008-01]

dc:subject

dc:subject

726.79Parts and accessory structures

Including cells, refectories[2009-03-30]

726.79Parts and accessory structures

Including cells, cloisters, refectories [2005-11-02] {2009-03-30}

726.796Cloisters

Class here comprehensive works on cloisters [formerly 726.69]

[2009-03-30]

Cloister

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

Search without versioning and Semantic Network

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??

ddc=726.796

Infirmarien – Kranken- und Sterbehäuser der Mönche [2010-02]

Mittelalterliche Kreuzgänge in Europa [2008-02]Die singenden Steine von Moissac [2010-03]

Kloster Wedinghausen – Westflügel [2008-03]

Der Kreuzgang der Abtei Altenryf

[2008-01]

726.79Parts and accessory structures

Including cells, (cloisters), refectories

726.796Cloisters

Class here comprehensive works on cloisters

[formerly 726.69]

Cloister

?

?

?

?

?

Die singenden Steine von Moissac [2010-03]

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

Search with versioning and Semantic Network

13

ddc=726.796

Infirmarien – Kranken- und Sterbehäuser der Mönche [2010-02]

Mittelalterliche Kreuzgänge in Europa [2008-02]Die singenden Steine von Moissac [2010-03]

skos:closeMatch[2010-06-16]

skos:broaderskos:narrower

dct:isReplacedBy

dc:subject

dc:subject

dc:subjectskos:broadMatch[2007-01-01] {2010-06-16}

dc:subject

dct:replaces

Kloster Wedinghausen – Westflügel [2008-03]

Der Kreuzgang der Abtei Altenryf

[2008-01]

dc:subject

dc:subject

726.79Parts and accessory structures

Including cells, refectories[2009-03-30]

726.79Parts and accessory structures

Including cells, cloisters, refectories [2005-11-02] {2009-03-30}

726.796Cloisters

Class here comprehensive works on cloisters [formerly 726.69]

[2009-03-30]

Cloister

!!

!! !

!

!Die singenden Steine von Moissac [2010-03]Mittelalterliche Kreuzgänge

in Europa [2008-02]

Der Kreuzgang der Abtei Altenryf

[2008-01]

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

There can be irrelevant documentsin the search results

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? ??

ddc=726.796

Infirmarien – Kranken- und Sterbehäuser der Mönche [2010-02]

Mittelalterliche Kreuzgänge in Europa [2008-02]Die singenden Steine von Moissac [2010-03]

skos:closeMatch[2010-06-16]

skos:broaderskos:narrower

dct:isReplacedBy

dc:subject

dc:subject

dc:subjectskos:broadMatch[2007-01-01] {2010-06-16}

dc:subject

dct:replaces

Kloster Wedinghausen – Westflügel [2008-03]

Der Kreuzgang der Abtei Altenryf

[2008-01]

dc:subject

dc:subject

726.79Parts and accessory structures

Including cells, refectories[2009-03-30]

726.79Parts and accessory structures

Including cells, cloisters, refectories [2005-11-02] {2009-03-30}

726.796Cloisters

Class here comprehensive works on cloisters [formerly 726.69]

[2009-03-30]

Cloister

? ?

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

15

The modifications in the DDC can lead to incomplete search results

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

16

In spite of the modification thesearch result should be correct

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

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Identifier and a Semantic Network for better search results

ddc=726.796

Infirmarien – Kranken- und Sterbehäuser der Mönche [2010-02]

Mittelalterliche Kreuzgänge in Europa [2008-02]Die singenden Steine von Moissac [2010-03]

skos:closeMatch[2010-06-16]

skos:broaderskos:narrower

dct:isReplacedBy

dc:subject

dc:subject

dc:subjectskos:broadMatch[2007-01-01] {2010-06-16}

dc:subject

dct:replaces

Kloster Wedinghausen – Westflügel [2008-03]

Der Kreuzgang der Abtei Altenryf

[2008-01]

dc:subject

dc:subject

726.79Parts and accessory structures

Including cells, refectories[2009-03-30]

726.79Parts and accessory structures

Including cells, cloisters, refectories [2005-11-02] {2009-03-30}

726.796Cloisters

Class here comprehensive works on cloisters [formerly 726.69]

[2009-03-30]

Cloister

Die singenden Steine von Moissac [2010-03]Mittelalterliche Kreuzgänge

in Europa [2008-02]

Der Kreuzgang der Abtei Altenryf

[2008-01]

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010

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Thank you for your attention!

c.effenberger@d-nb.de

j.hauser@d-nb.de

| 18 | Concepts in Context | Versioning of the DDC | July 19, 2010