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• In English: http://en.wikipedia.org/wiki/Digital_Author_Identification
• In Dutch: http://nl.wikipedia.org/wiki/Digital_Author_Identification

Syntax

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By design a DAI is a promoted Pica Production Number (PPN) resulting from a positive match between a person identified by a record in the NTA and an appointment registered in the local CRIS system. This makes that a DAI can only be assigned to researchers appointed at a university.

Background

The DAI, Digital Author Identifier, in the Netherlands was developed to prevent ambiguity in retrieving the work of one author, and to uniquely identify an author by a numeric identifier in order to overcome the problems imposed by name variants.

systems, parts and components

The Author Identification System consists of a central component - the National Thesaurus for Author names (NTA), part of the Shared Cataloguing System (GGC) - and decentral components - the local Current Research Information System (CRIS) - located at each university. Currently, all universities have implemented the METIS system as their CRIS solution.

responsibilities

OCLC is responsible for technical application management (BiSL: Application management) of the GGC and by that, the NTA. The partner who is responsible for the functional management (BiSL: Business information management) is still under discussion at the UKB meetings (UKB is the collaboration between the research libraries and the National library). The National Library is a candidate. The CRIS systems are under the responsibility of the universities and research institutes.

data range

The GGC is part of a generic bibliographic cataloguing database, thus the NTA contains a broad spectrum of authors from novelists to scientific authors.
By design a DAI is a promoted Pica Production Number (PPN) resulting from a positive match between a person identified by a record in the NTA and an appointment registered in the local CRIS system. This makes that a DAI can only be assigned to researchers appointed at a university.
The match against the NTA theoretically also implies that the researcher must have previously published to be included in the NTA. However when an NTA record has not been found when trying to create match with a local CRIS record, an NTA record may be created from the CRIS record in order to still be able to mint a DAI.

database quality

The NTA contains authors who are registered by Public Libraries and Research Libraries who are member of OCLC (Previously OCLC-PICA).
Population of the data is done by qualified cataloguers at libraries or specialist departments, and employees who administer the CRIS currently used by all Dutch universities, METIS.

database moderation

Changes in the central system may be made by cataloguers at university libraries and research information departments with access to WinIBW or WebGGC and METIS administrators, through a special version of the WebGGC. Note that each research institute is only allowed to make changes to the record-part associated with their own individual institution.

check, match, mint & assign

As said, the identifier is minted by a positive match between a person record in the NTA and an appointment record in the local CRIS.

From within the METIS application, the administrator uses a special version of the WebGGC for the NTA that preserves the context of the person selected in METIS. The administrator then searches the NTA for a positive match. If a match cannot be found, the administrator may create a new NTA record. The administrator then registers some metadata for the person according to the local METIS (e.g. name, date of birth, employee id, appointment date). Upon completion of this proces, the resulting DAI is sent back to the METIS.

Institutions that do not use the METIS application can use either the WinIBW application (a generic application used by libraries that are already cataloguing in the GGC) or the WebGGC webinterface.

Syntax

The DAI (or PPN) contains 9 to 10 characters. The first 8 first 8 to 9 characters are numbers. The last (9th or 10th) character is a control character. The control character is a modulus a modulus 11 check digit, like in the ISBN. More on the Mod11 MOD11 algorithm can be found on for example wikipedia.

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The DAI is the number after the string info:eu-repo/dai/nl/ .  A A DAI is a number like 123456785. The last character is a MOD11 check-digit.

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