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About Web NDL Authorities


1. Overview of the Service | 2.What is Authority Data? | 3. The Scope of Provision and Standards for Creation of Authority Data | 4. Handling Personal Information in the Creation and Provision of Authority Data | 5. Notes


1. Overview of the Service

Web NDL Authorities is a service by the National Diet Library (NDL), Japan, to access authority data created and maintained by the NDL.

In addition to being able to search authority data via “keyword search” and “classification number search”, you can download individual files of all types of the authority data and batch files of the National Diet Library Subject Headings (NDLSH) .

Web NDL Authorities provides a variety of search functions, including search for the relevant bibliographic data by author or subject headings in collaboration with NDL Search.

Web NDL Authorities is based technically on the Semantic Web, which assigns semantically clear data to information resources on the Web. Each record in the authority data can be referenced via a URI in conformance to the Resource Description Framework (RDF) data model, and is searchable via SPARQL.

Authority data is automatically updated daily with new additions, corrections, and deletions. Additionally, notifications are provided via RSS feed for newly established subject headings within the NDLSH.

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2. What is Authority Data?

NDL maintains bibliographic data such as title or author, to facilitate users’ access to the relevant resources. Name headings or Subject headings are assigned to the bibliographic data to distinguish different people with the same name or to identify people who use pseudonyms, nonstandard spellings, transliterated names, or other variants.
To control these headings, authority data is organized to indicate alternative headings, synonyms, and the basis of selection for the headings.

Author Spellings Heading
シェークスピア

シェイクスピア

シェークスピヤ

シェイクスピア, ウィリアム

沙士比阿
Shakespeare, William, 1564-1616

Authority data for the heading “Shakespeare, William, 1564-1616”

Type of Authority Personal Name
Heading Shakespeare, William, 1564-1616
Variant(s) シェークスピア
シェクスピア
シェイクスピア
シェイクスピア, ウィリアム
沙士比阿
Source マクベス

For more information about the data item, please refer to “Help>Table 2. List of Detail Screen item list”.

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3. The Scope of Provision and Standards for Creation of Authority Data

All of the authority data the NDL currently maintains is available on the Web NDL Authorities. Specifically, “Personal Name”, “Family Name”, “Corporate Body Name”, “Geographic Name”, “Uniform Title”, “Topical Term”, and “Subdivision” used under the subject headings are available. Subject authorities also include “Subjects Headings with Subdivisions” in its scope of provision.

Authority data is divided roughly into “Authority File for Authors” and “Subject Authority File”. The same Authority File for Authors and Subject Authority File for personal names, corporate body names, and country names, and geographical authorities corresponding to administrative units are used.

For information on how to select and form the author headings, please refer to the “Rules for Selection and Form of Headings for Personal Names (Since January 2012)” (in Japanese) and the “Rules for Selection and Form of Headings for Corporate Body Names (Since January 2012)” (in Japanese).

For guidelines on subject heading creation and assignment, please refer to the “National Diet Library Subject Cataloging Manual (March 2016) (PDF: 1.45MB)”  (in Japanese) and the “National Diet Library Subject Headings (NDLSH) Subdivisions List (March 2016) (PDF: 720KB)” (in Japanese).

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4. Handling Personal Information in the Creation and Provision of Authority Data

For information on the handling of personal information in personal name authority data within the Web NDL Authorities, please see the “Handling of Personal Information in bibliographic data”(in Japanese).

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5. Notes

Please note the following when using the Web NDL Authorities.
  • The NDL holds all copyrights to the contents of the Web NDL Authorities. For terms and conditions of use, please see the “Terms of Use”.

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