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Standards for Digital Information

The National Diet Library (NDL) has applied or maintained the standards of digital information technology for collecting, preserving, and providing access to digital resources, aiming at the efficient management of digital resources and improvement of interoperability between internal and external systems.

Resource Description Standards

Metadata Standards

The NDL has maintained a description metadata standard, "National Diet Library Dublin Core Metadata Description (DC-NDL)."

The DC-NDL is compliant with the recommendations of the Dublin Core Metadata Initiative (DCMI) such as "DCMI Metadata Terms," "Singapore Framework" and "Guidelines for Dublin Core Application Profiles."

The DC-NDL is implemented in the integrated search system "NDL Search," "NDL Digital Archiving System" and so on, as a common communicative metadata format.

Cataloging Standards

The NDL has used "MARC21" as the representation and communication format of bibliographic data since January 2012. The NDL applies "Nippon Cataloging Rules 1987 third revised edition" (2006) for cataloging Japanese books, and "Anglo-American Cataloging Rules, second edition, Japanese edition" (1982) for cataloging Western books. For more details, please refer to the link below.

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Linked Open Data (LOD)

The NDL provides some kinds of data as Linked Open Data (LOD). Please see the following pages for further details about our LOD:

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International Standard Identifiers

International Standard Serial Number (ISSN)

  • Japanese National Centre for ISSN
    International Standard Serial Numbers (ISSN) comprise an international numbering system for serial publications. The NDL operates the National Centre for ISSN in Japan.

International Standard Identifier for Libraries and Related Organizations (ISIL)

  • Japanese National Agency for ISIL
    International Standard Identifier for Libraries and Related Organizations (ISIL) are identifiers which can be allocated to libraries and other relevant organizations, such as archives and museums. ISO 15511 specifies that the ISIL structure be administrated by national allocation agencies in each country. The NDL operates the National Agency for ISIL in Japan.

Digital object identifier (DOI)

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Digitization of Library Materials

The NDL, in digitizing its materials, compiles the handbook for the purpose of ensuring the quality of data and enhancing the efficiency of digitization by establishing a standard through sharing common specifications and technology.

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Usability and Web Accessibility

For the NDL’s activities of usability and web accessibility, please see Web Accessibility.

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Translations of Documents on Standards for Digital Information

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Contact for inquiries about Standards for Digital Information

The National Diet Library, Digital Information Department
Digital Information Distribution Division, Standardization Section
E-mail: standardizationat n d l dot g o dot j p

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