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Abstract

The International DOI Foundation (IDF) recently published the third edition of its DOI Handbook, which sets the scene for DOI's expansion into much wider applications. Edition 3 is not simply an updated user guide. A great deal has happened in the underlying technologies and in the practical deployment and development of DOIs (Digital Object Identifiers) since the last edition was published a year ago. Much of the program of technical work foreseen at the inception of DOIs has now been completed. The initial simple implementation of DOI as a persistent name linked to redirection continues to grow, with approaching ten million DOIs assigned from several hundred organisations through a number of Registration Agencies in USA, Europe, and Australasia, supporting large scale business uses. Implementations of more sophisticated applications (offering associated services) have been developing well but on a smaller scale: a framework for building these has been completed as part of the latest release and promises to stimulate a new wave of growth. From its original starting point in text publishing, there has been gradual embrace by a number of communities: these include national libraries (a consortium of national libraries recently joined the IDF); government documentation (with the appointment of TSO The Stationery Office in the UK as a DOI agency and the announced intention of the EC Office of Publications to use DOIs); non-English language markets (France, Germany, Spain, Italy, Korea). However implementations in non-text sectors have been far slower to develop, though several are now under discussion. The DOI community can point to several significant achievements over the past few years: * A practical successful open implementation of naming objects, treating content as information objects, not simply packets of bits; * The IDF's role in co-sponsoring, championing, and now implementing the <indecs>T framework as a semantic tool for structured metadata - an essential step for treating content as information in Semantic-Web-like applications; * A template for building advanced applications, connecting resolution and metadata technologies, and offering hooks to web services and similar applications; * The development of a policy framework that allows multiple communities autonomy; * The practical implementation of DOIs with emerging related standards such as the OpenURL framework in contextual linking.

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Abstract

Over the past few months the International DOI Foundation (IDF) has produced a number of discussion papers and other materials about the Digital Object Identifier (DOIsm) initiative. They are all available at the DOI web site, including a brief summary of the DOI origins and purpose. The aim of the present paper is to update those papers, reflecting recent progress, and to provide a summary of the current position and context of the DOI. Although much of the material presented here is the result of a consensus by the organisations forming the International DOI Foundation, some of the points discuss work in progress. The paper describes the origin of the DOI as a persistent identifier for managing copyrighted materials and its development under the non-profit International DOI Foundation into a system providing identifiers of intellectual property with a framework for open applications to be built using them. Persistent identification implementations consistent with URN specifications have up to now been hindered by lack of widespread availability of resolution mechanisms, content typology consensus, and sufficiently flexible infrastructure; DOI attempts to overcome these obstacles. Resolution of the DOI uses the Handle System®, which offers the necessary functionality for open applications. The aim of the International DOI Foundation is to promote widespread applications of the DOI, which it is doing by pioneering some early implementations and by providing an extensible framework to ensure interoperability of future DOI uses. Applications of the DOI will require an interoperable scheme of declared metadata with each DOI; the basis of the DOI metadata scheme is a minimal "kernel" of elements supplemented by additional application-specific elements, under an umbrella data model (derived from the INDECS analysis) that promotes convergence of different application metadata sets. The IDF intends to require declaration of only a minimal set of metadata, sufficient to enable unambiguous look-up of a DOI, but this must be capable of extension by others to create open applications.