1. An Overview of Dublin Core Metadata Schema Registry
Shigeo Sugimoto Research Center for Knowledge Communities
Grad. School of Library, Information and Media Studies University of Tsukuba Tsukuba, Ibaraki, Japan
sugimoto @ slis. tsukuba. ac. jp

2. Agenda/Outline Introduction to Dublin Core Registry Demo by Snapshots
History
Functions
Multi-linguality Issues
Demo by Snapshots
Some New Features of Dublin Core
DC 15 elements in two namespaces
Dublin Core Abstract Model
Application Profiles
Summary

3. History
Project started at Asian Institute of Technology (AIT), Thailand under supervision of Thomas Baker in 1998
DCMI Registry WG since 1999
WG home:
The DCMI registry provides definitions of DCMI Terms
Registry was moved from OCLC to U.Tsukuba in February 2008

4. Basic Functions Search and Browse Dublin Core Terms
User Interface on the Web
Application Interfaces
Dublin Core Terms expressed in RDF
Application Interfaces that return RDF descriptions
Vocabulary Maintenance Tool
Used by Usage Board
Multilingual Feature
25 languages

5. Application Interface
Provides Registry application interface - a collection of Web services
SOAP and REST.
Return results in RDF/XML format
See Help page from DCMI Registry

6. Application Interface
Services
listItemSummary
listSupportedLanguage
listItemDetail
getUpdates
listElements
listElementRefinements
listVocabularyTerms
listEncodingSchemes

7. Multi-lingual Issues
Translation of the DCMI terms was recognized as an important issue for DCMI from very early stage of the development of DCMI terms.
Translations of DCMI terms have been done by volunteers
A few national standards
A few official local affiliates
Multi-lingual functions
Browse
Search
Translation Support

8. Demo by Snapshots

10. Link to DCMI Registry

12. Browse | Search

14. Pull Down Menu

15. Summary of All Terms
Properties
Classes
Vocabulary Encoding Schemes
Syntax Encoding Schemes

16. Click on “Browse” button to browse
“Summary of All Terms”

18. Click on “dc:contributor”

20. Scroll Down

23. Language Preference

24. Language Preference
25 languages
Select Japanese

26. A Note on Translations
Not all of translations are up to date.

29. Display in Japanese

30. Click on dc:contributor

32. Display in Japanese

33. Snap shots of multilingual output

34. Snap shots of multilingual output

35. Display in RDF/XML

36. RDF/XML output

37. Display in N-TRIPLE

38. N triple

39. Display in N3

40. N3

41. Contents of DCMI Registry

42. Contents of DCMI Registry

43. Contents of DCMI Registry

44. Contents of DCMI Registry

45. Contents of DCMI Registry

46. Contents of DCMI Registry
71 properties
15 properties in “dc” namespace
56 properties in “dcterms” namespace
35 classes
9 vocabulary encoding schemes
11 syntax encoding schemes
4 collections

47. A New Feature of Dublin Core
Why two namespaces?
Each of the Dublin Core 15 elements appears two times in the list
“dc” namespace as a legacy namespace
“dcterms” namespace for all terms
Re-definition of Dublin Core 15 elements
Visible through the registry

48. Go back to All Terms Page

49. Two “Date” Elements

50. “Date” element in different namespaces

52. Two “Contrubutor” Elements

54. Only one “Audience” element

55. dc: contributor and dcterms:contributor

56. Contributor in “dc” namespace
dc: contributor and dcterms:contributor
Contributor in “dc” namespace

57. dc: contributor and dcterms:contributor

58. dc: contributor and dcterms:contributor
Contributor in “dcterms” namespace

59. Examples of a Contributor Note A second property with the -----
“dc”
“dcterms”
URI
Label
Contributor
Definition
An entity responsible
Comment
Examples of a Contributor
Note
A second property with the
-----
Namespace
Type of Term
Property
Has Range
dcterms:Agent
Version
contributor-006
contributorT-001
Date Issued
Date Modified
Refines
------
dc:contributor
Is Refined By
dcterms:contributor  
dcterms:creator  

60. Comparison of dc:contributer and dcterms:contributor
URI
Label
Contributor
Definition
An entity responsible
Comment
Examples of a Contributor
Examples of a Contributor i
Note
A second property with the
-----
Namespace
Type of Term
Property
Has Range
dcterms:Agent
Version
contributor-006
contributorT-001
Date Issued
Date Modified
Refines
------
dc:contributor
Is Refined By
dcterms:contributor  
dcterms:creator  

61. Comparison of dc:contributer and dcterms:contributor
URI
Name space
Has Range
-----
dcterms:Agent
Refines
------
dc:contributor
Is Refined By
dcterms:contributor  
dcterms:creator  

62. Relationships among terms
No relationship defined
dc:contributor
dc:creator
Is refined by/Refines
dcterms:creator
dcterms:contributor
Is refined by/Refines

63. Relationships among terms
Re-definition of the 15 elements and other elements
allows to use legacy definition of Simple Dublin Core elements (ISO 15836)
allows to define relationships among the re-defined 15 elements as well as all other elements
allows to include domain/range definition of elements (i.e. properties)

64. Some other new features DCMI Abstract Model (DCAM)
DCAM defines basic concepts and constructs of Dublin Core and relationships among them
The DCAM document [3] is provided to
Specify the components and constructs used in Dublin Core metadata
Define the nature of the components used and describes how those components are combined to create information structures
Provide an information model which is independent of any particular encoding syntax

65. Some other new features Singapore Framework [4]
(Re-)Definition of Application Profiles
Five components of an Application Profile
Functional requirements (mandatory)
describe the functions that the application profile is designed to support
Domain model (mandatory)
defines the basic entities described by the application profile and their fundamental relationships

66. Some other new features Singapore Framework
Description Set Profile (DSP) (mandatory)
define a set of metadata records that are valid instances of an application profile.
Usage guidelines (optional)
describe how to apply the application profile, how the used properties are intended to be used in the application context etc.
Encoding syntax guidelines (optional)
describe any application profile-specific syntaxes and/or syntax guidelines, if any.

67. Description Set Profile [5]
Description Set Profile is defined as a set of Description Template
A Description Template is a set of properties specified with structural and value constraints
Structural constraints: mandatory levels, cardinality, etc.
Value constraints: classes or types of values associated with the property

68. A Simplified Structural View of a an Application Profile
Functional requirements
Usage guidelines
Domain model
Encoding syntax guidelines
Description Set Profile
Description Template
Description Template
Description Template
Terms

69. A Simplified Structural View of a an Application Profile
A Description Set
termA: Mandatory
termC: Optional
Repeatable
termX: Mandatory
Repeatable
termZ: Mandatory
if applicable
termA
termB
termC
termX
termY
termZ
Metadata Vocabulary 2
(Metadata Element Set)
Metadata Vocabulary 1
(Metadata Element Set)

70. A Simplified Structural View of an Application Profile
A Description Set
termA: Mandatory
termC: Optional
Repeatable
termX: Mandatory
Repeatable
termZ: Mandatory
if applicable
A Description Set is defined using metadata terms defined in one or more metadata vocabularies (element sets).
termA
termB
termC
termX
termY
termZ
Metadata Vocabulary 2
(Metadata Element Set)
Metadata Vocabulary 1
(Metadata Element Set)

71. Summary DCMI Registry stores/provides DCMI terms
Properties, Classes, etc.
Dublin Core recommends to define metadata schemas reusing existing metadata terms, i.e. Mixing and Matching Metadata Schemas
Metadata Schema Registry is a crucial service to enhance Mixing and Matching

72. Summary
DCMI Registry provides only terms defined by DCMI and many links to external resources and terms
User-friendly function to connect registries and information resources would be required to enhance usability for human users
DCMI Registry provides only canonical information, i.e. information encoded in RDF Schema
Users would want to get another type of information, e.g., good practices and explanations of terms with good examples.

73. References Dublin Core Metadta Initiative http://www.dublincore.org/
DCMI Registry
Dublin Core Abstract Model
Singapore Framework
Description Set Profile,

74. appendix
A Grahic Viewer of NDLSH (National Diet Library Subject Heading)
Example graph
Example XML

75. A Graphic View of term “Tosyokan” (library in Japanese)
A node represents a term
Coloured arrows mean BT, NT, RT relatiponships.

76.   <?xml version="1.0" encoding="UTF-8" ?>
- <rdf:RDF xmlns:rdf=" xmlns:skos=" xmlns:slis=" xmlns:dc="
- <skos:Concept rdf:ID="
  <dc:identifier> </dc:identifier>
  <skos:prefLabel xml:lang="ja">図書館〈地理区分〉</skos:prefLabel>
- <slis:annotation>
- <slis:JapaneseTransliteration>
  <slis:label xml:lang="ja">図書館〈地理区分〉</slis:label>
  <slis:transcription xml:lang="ja">トショカン</slis:transcription>
  </slis:JapaneseTransliteration>
  </slis:annotation>
  <skos:altLabel xml:lang="ja">公共図書館</skos:altLabel>
  <slis:label xml:lang="ja">公共図書館</slis:label>
  <slis:transcription xml:lang="ja">コウキョウトショカン</slis:transcription>
  <skos:altLabel>Libraries</skos:altLabel>

77. <skos:narrower rdf:resource="http://raus. slis. tsukuba. ac
<<<snip>>>
  <skos:related rdf:resource=" />
  <skos:related rdf:resource=" />
  <skos:related rdf:resource=" />
  <skos:related rdf:resource=" />
  <skos:related rdf:resource=" />
  <dc:relation rdf:datatype= "
  <dc:relation rdf:datatype= "
  </skos:Concept>
  </rdf:RDF>