Open Source Software for Digital Preservation Repositories: a Survey <s> EPrints <s> At the core of the MPEG-21 Multimedia Framework is the concept of the Digital Item, a virtual container for a hierarchical structure of metadata and resources. This paper considers the Digital Item Declaration Language (DIDL), gives examples of its usage, and discusses how it is used to integrate other parts of MPEG-21. The paper then discusses how Digital Item Identification integrates with the DIDL to allow MPEG-21 to utilize standard identifiers from many application spaces. Finally, an alternative, compressed form of the XML Digital Item Declaration is described. This uses schema-based compression to significantly reduce the size of these XML documents. <s> BIB001 </s> Open Source Software for Digital Preservation Repositories: a Survey <s> EPrints <s> Setting up an institutional repository (IR) can be a daunting task. There are many software packages out there, some commercial, some open source, all of which offer different features and functionality. This article will provide some thoughts about one of these software packages: Eprints. Eprints was one of the first IR software packages to appear and has been available for 10 years. It is under continual development by its creators at the University of Southampton and the current version is v3.2.3. ::: Eprints is open-source, meaning that anyone can download and make use of the software for free and the software can be modified however the user likes. This presents clear advantages for institutions will smaller budgets and also for institutions that have programmers on staff. Eprints requires some additional software to run: Linux, Apache, MySQL, and Perl. This software is all open-source and already present on the servers of many institutions. There is now a version of Eprints that will run on Windows servers as well, which will make the adoption of Eprints even easier for some. ::: In brief, Eprints is an excellent choice for any institution looking to get an IR up and running quickly and easily. Installation is straightforward as is the initial configuration. Once the IR is up and running, users may upload documents and provide the necessary metadata for the records by filling out a simple web form. Embargoes on published documents are handled elegantly by the software, and the software links to the SHERPA/RoMEO database so authors can easily verify their rights regarding IR submissions. Eprints has some drawbacks, which will be discussed later in the review, but on the whole it is easy to recommend to anyone looking to start an IR. However, It is less clear that an institution with an existing IR based on another software package should migrate to Eprints. <s> BIB002
EPrints BIB002 is a software package for building open access repositories, licensed under GNU GPLv3. EPrints is primarily used for institutional repositories and scientific journals as it provides open access, i.e., immediate online access to the full text of research articles within the repository. Its flexible configuration and web-based nature allow it to be also used as a repository for images, research data or audio archives. EPrints provides a set of ingest, preservation, dissemination and reporting services for institutions open access needs  . EPrints was created in 2000 as a result of the 1999 Santa Fé meeting, where the discussion for the creation of a communication protocol for digital repositories interoperability gave birth to the OAI-PMH protocol  . EPrints provides a stable yet flexible infrastructure on which institutions have been building their open access digital repositories. Examples includes governmental departments, universities, hospitals and non-profit organizations  . Through EPrints Servicesa not-for-profit commercial services organization -academic and research institutions can benefit from training, as well as, aid on the development and hosting of repositories. The project has been developed at theUniversity of Southampton, School of Electronics and Computer Science. It encompasses developers, librarians and users. The software is a full stack web application consisting of a database, storage manager and a customizable front end web interface. Besides the web-based application, EPrints provides a command-line interface. Both interfaces are based on the LAMP architecture, using the PERL programming language in substitution of LAMP's usual PHP language. EPrintsuses a plugin architecture for importing and exporting data, creating representation of objects appropriate for indexation of search engine and for user interface widgets. Plugins are developed in the PERL language.EPrints supports the ingestion of practically any type of file. In addition to the above stated, EPrintshas the following features BIB002 : -Advanced search with autocomplete features. -Lightweight metadata collection with METS and MODS export plugins. -Tagmechanism and collection-based methods to classify digital materials. -Support for multiple idioms. The following standards are available within EPrints: OAIS, OAI-PMH, SWORD, Dublin Core, METS, MODS (Metadata Object Description Schema) and DIDL (Digital Item Declaration Language) BIB001 . Regarding software, EPrints is based on PERL (programming language and implementation),HTML/CSS (user interface) and uses MySQL as its backend database server.