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Japanese Metadata Standards“National Diet Library Dublin CoreMetadata Description (DC-NDL)“
: Describing Japanese Metadata andConnecting Pieces of Data
Saho YasumatsuNational Diet Library,
Japan
Akiko HashizumeNational Diet Library,
Japan
Julie FukuyamaNational Diet Library,
Japan
Overview
1. About the National Diet Library2. What is the DC-NDL?3. Features of the DC-NDL4. Using the DC-NDL: NDL Search5. Future plans for the DC-NDL
2
1. About the National Diet Library
3
The National Diet Library (NDL)Tokyo Main Library Kansai-kan
International Library of Children's Literature
4
The National Diet Library (NDL)
• National Library
• Diet (Parliament) Library
5
NDL
Legal Deposit System
Users
Provide
(Books, Journals, etc.)Japanese publications
• Make metadata• Preserve collections
6
Collections are searchable throughNDL-OPAC and NDL Search on website
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NDL aims to promote the use of Linked Data and provides metadata as Linked Data
http://www.ndl.go.jp/en/aboutus/standards/lod.html8
The main topic of this presentation
The National Diet LibraryDublin Core Metadata Description(DC-NDL)
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2. What is the DC-NDL?
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The DC-NDL is
• A descriptive metadata standard• Utilized primarily for converting catalog
records of publications held by the NDL into metadata
• Based on the Dublin Core Metadata Element Set and the DCMI Metadata Terms
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1. NDL Metadata Terms2. Application Profile3. RDF Schema
FOCUS
The DC-NDL
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Item Information
Administrative Information
Bibliographic Information
Basic structure of the DC-NDL
FOCUS
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A Brief History• Revised three times since launch
• Reflecting : revisions to the Dublin Core: expansion of NDL services
March 2001May 2007June 2010December 2011 current
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3. Features of the DC-NDL
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The key functions of the DC-NDL:
1. Representing the yomi (reading) of the Japanese language: for accommodating certain unique features of the Japanese language
2. Connectivity with Linked Data: for maintaining the broad perspective of linking tothe world's data
3. Compatibility with digitized materials: for accommodating NDL activities
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3.1. Representing reading ofJapanese language
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Japanese language has threedistinct types of characters
All of these words are read as "i-chi-go (strawberry)“
: ‘hiragana’
: ‘katakana’
: ‘kanji’
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Some words have several different readings
su-i-ka
ni-shi-u-ri(watermelon)
Watermelon in Japanese could be read as either"su-i-ka" or "ni-shi-u-ri"
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Reading varies depending upon meaning
ga-ku
hi-ta-i
The word “ ” could be read as either“ga-ku“ or “hi-ta-i“
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: “ga-ku”(frame)
: “hi-ta-i”(forehead)
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Without spaces inserted between words, it is difficult to understand meaning
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"Koko-de-wa-kimono (means ‘clothes’)-wo-nuide-kudasai"
"Koko-de-hakimono (means ‘shoes’)-wo-nuide-kudasai"
(Case 1)
(Case 2)
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DC-NDL defines metadata terms to represent characteristics of the Japanese language
→ E.g. Title field
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(1)DC-NDL defines original properties such as Transcription
Extract data from Bibliographic Information
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(2)Value stored in Transcription property is sentence with blanks between words
Extract data from Bibliographic Information
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(3)Title representation and reading described as a set, using dc:title in its range
Extract data from Bibliographic Information
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3.2. Connectivity with Linked Data
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DC-NDL uses URI values to link with other data
→ E.g. creator and subject
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VIAF
Bibliographic data
Example of link to "dcterms:creator"
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A Web NDL Authorities’ link to VIAF
VIAF
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Example of using URIs in "dcterms:subject"
URI of the Nippon Decimal Classification (NDC)9th edition
<dcterms:subject rdf:resource="http://id.ndl.go.jp/class/ndc9/210.02"/>
URI of the National Diet Library Classification (NDLC)<dcterms:subject rdf:resource="http://id.ndl.go.jp/class/ndlc/GB38"/>
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Example of link to "dcterms:subject"
LCSH
Bibliographic data
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A Web NDL Authorities’ link to LCSH
LCSH
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3.3. Compatibility with digitized materials
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DC-NDL defines metadata terms to describe digitized contents
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Example of terms for digitized content
Description of the publisher of the digitized version<dcndl:digitizedPublisher>National Diet Library</dcndl:digitizedPublisher>
Date when the content was digitized<dcndl:dateDigitized>2013</dcndl:dateDigitized>
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4. Using DC-NDL:NDL Search
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What is NDL Search?
http://iss.ndl.go.jp/ 39
NDL, public libraries, academic libraries, archives, museums, and academic research institutions in Japan
A gateway to rich repository of information
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41
About
85millonMetadata
• 69 institutions
• 85millon Metadata
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RDF data
*You can use our metadata freely, if your use isnon-commercial.
provides DC-NDL metadata records in RDF via API
API
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5. Future plans for the DC-NDL
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For connecting more data:
We need more connections to other links • We must examine which elements are
appropriate for linking with other data and which URIs are suitable to include in our data
• We need to identify data that can be linked with ours
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Thank you for your attention! Feel free to ask any questions.
Saho Yasumatsu
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