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Top > About Us > Assignment of a DOI name to an object by NDL

Assignment of a DOI name to an object by NDL

What is DOI?

DOI (Digital Object Identifier) is a global identifier for digital contents, providing a resolvable persistent network link to current information about an object.
Japan Link Center (JaLC) is one of the DOI Registration Agencies managed by the National Institute for Materials Science (NIMS), the National Institute of Informatics (NII), the National Diet Library (NDL) and the Japan Science and Technology Agency (JST).

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DOI name syntax

A DOI name has two components, prefix and suffix, which together form the DOI name, separated by a slash (/). The suffix portion following the slash (/) may be an existing identifier or any unique string chosen by the registrant. The prefix portion preceding the slash (/) denotes a unique naming authority. The DOI name functions as a URI (Uniform Resource Identifier) by adding "https://doi.org/" before it.

A DOI name can be resolved within the DOI system to values of one or more types of data relating to the object identified by that DOI name, such as a URL.

You can see that resolving by typing "DOI name as URI" into your browser or typing a DOI name into "DOI Resolver" on website of JaLC.

"DOI Resolver"

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The role of NDL

The NDL will assign DOI names to digitized contents. The prefix given by the NDL is "10.11501" and the suffix is the same as the "Persistent ID" contained in the "NDL Digital Collections" to be used for unique identification.

The DOI name given by the NDL can be resolved within the DOI system to the URL of "NDL Digital Collections" as follows.

You can confirm "Persistent ID" on the Content Viewer of the "NDL Digital Collections"

the Content Viewer of the "NDL Digital Collections"

Firstly, the NDL assigned DOI names to about 140,000 Japanese doctoral dissertations, received by the NDL from 1991 to 2000 and digitized. For details, please refer to "NDL Digital Collections > Doctoral Dissertations".

  • The list of DOI names assigned to Japanese doctoral dissertations(Japanese only, February 24, 2014) (ZIP: 67.4MB)

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