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...ibrary organization such as those expressed within the Functional Requirements for Bibliographic Records (FRBR) [7]. Fedora expresses relationships by defining a base relationship ontology using RDFS =-=[17]-=- and provides a slot in the digital object abstraction for RDF expression of relationships based on this ontology. Assertions from other ontologies may also be included along with the base Fedora rela...

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... the results of this work later in this paper. While there are a number of schemes for representing these relationships such as conventional relational databases and formalisms like conceptual graphs =-=[50]-=-, the products of the semantic web initiative such as RDFS [22], OWL [27], and highlyscalable triple-stores such as Kowari [55] provide extensible open-source solutions for representation, manipulatio...

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..., management, and preservation of existing and evolving forms of digital content. The roots of the project lie in DARPA-funded research in the early 1990’s that defined the notion of a digital object =-=[34]-=- and implemented Dienst [36], a networked digital library architecture with protocol-based dissemination of digital objects in multiple formats. Follow-on research extended these initial concepts wit...

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...ssing complex digital objects. Objects are encoded in XML using DIDL [21] and a limited set of object relationships can be expressed using RDF. Object dissemination services are available via OAI-PMH =-=[38]-=- and OpenURL [40], The current release of Fedora is version 2.0, which includes the semantic web integration that is a focus of this paper. Release 2.1 is scheduled for 3 rd quarter 2005 and will incl...

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...a in an educational digital library like the National Science Digital Library [64]. • Modeling more complex forms of network overlays over the resources in a content repository such as citation links =-=[29, 31]-=-, link structure, friend of a friend [7], etc. All of these relationships, including structural relationships, should be expressible both within individual digital objects and among multiple digital o...

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...ages, RDQL [48], iTQL [54], and SPO [47] 5 . Both RDQL and iTQL share a superficially similar syntax to SQL, with RDQL enjoying broader implementation support, but iTQL providing a richer feature set =-=[30]-=-. The RDF query results naturally take the form of rows of key-value pairs, again similar to the result sets returned by a SQL query. However, it is often useful to work with a sub-graph or a construc...

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...on of existing and evolving forms of digital content. The roots of the project lie in DARPA-funded research in the early 1990’s that defined the notion of a digital object [34] and implemented Dienst =-=[36]-=-, a networked digital library architecture with protocol-based dissemination of digital objects in multiple formats. Follow-on research extended these initial concepts with the notion of active digit...

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...cations. This distinguishes Fedora from other complex object systems that are turn-key, vertical applications for storing and manipulating complex objects through a fixed user interface (e.g., DSpace =-=[49]-=-, arXiv [1], ePrints [3], Greenstone [10]). By providing both a model for digital objects and repository services to manage them, Fedora is also distinguished from work focused on defining and promoti...

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... active digital objects [26] and distributed active relationships [25]. These concepts were refined and prototyped in a CORBA-based Fedora (Flexible Extensible Digital Object Repository Architecture) =-=[42]-=- as part of research with CNRI [41] and in the context of the NSF-funded Prism Project [2]. This prototype provided the context for a variety of research initiatives most notably in the areas of fine-...

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...t of digital objects in other XML formats. Currently, the system supports a Fedora profile of the Metadata Encoding and Transmission Format (METS) [11] and it will soon support the OAI-PMH harvesting =-=[48]-=- of objects encoded in MPEG21 Digital Object Description Language (DIDL) [25]. 2 The FOXML schema is available at http://www.fedora.info/definitions/1/0/foxml1-0.xsd.s3 A service-based architecture fo...

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... which is a collaboration between the authors of this paper and colleagues at Cornell, LANL, and others [12] Pathways: Lifecycles for Information Integration in Distributed Scholarly Communication, , =-=[50]-=- Van de Sompel, H., Payette, S., Erickson, J., Lagoze, C. and Warner, S. Rethinking Scholarly Communication: Building the System that Scholars Deserve. D-Lib Magazine (September).then on components t...

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...stributed active relationships [25]. These concepts were refined and prototyped in a CORBA-based Fedora (Flexible Extensible Digital Object Repository Architecture) [42] as part of research with CNRI =-=[41]-=- and in the context of the NSF-funded Prism Project [2]. This prototype provided the context for a variety of research initiatives most notably in the areas of fine-grained policy enforcement [43] and...

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...8/index.html. We are planning a future publication that explores these results and their implications.sThe query interface to the relationship graph currently supports three RDF query languages, RDQL =-=[48]-=-, iTQL [54], and SPO [47] 5 . Both RDQL and iTQL share a superficially similar syntax to SQL, with RDQL enjoying broader implementation support, but iTQL providing a richer feature set [30]. The RDF q...

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...concept is currently being explored as part of a new NSF-funded research project, Pathways, which is a collaboration between the authors of this paper and colleagues at Cornell, LANL, and others [16] =-=[61]-=-.s- Dublin Core record, identified as info:fedora/demo:11/DC - High-resolution image, identified as info:fedora/demo:11/HIGH - Thumbnail image, identified as info:fedora/demo:11/THUMB - Image with zoo...

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...as led to its deployment in a variety of domains including digital libraries [35, 57], institutional repositories [53], electronic records archives [63], trusted repositories for digital preservation =-=[33]-=-, library systems [62], educational technologies [56], web publishing [23], and distributed information networks [37]. Fedora is implemented as a set of web services that provide full programmatic man...

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... the context of innovations in humanities research [58]. The experimentation proved successful, providing the basis for subsequent funding from the Andrew W. Mellon Foundation to Cornell and Virginia =-=[45]-=- to jointly develop Fedora and make it available as open source software to libraries, museums, archives, and content managers, facing increasing variety and complexity in the digital content that the...

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...totype to production repository software began when the University of Virginia Library, seeking a solution for managing increasingly complex digital content, experimented with the Fedora architecture =-=[51]-=-. This experimentation took place in the context of innovations in humanities research [58]. The experimentation proved successful, providing the basis for subsequent funding from the Andrew W. Mellon...

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... through 2007. The richness of the Fedora digital object model and extensibility of the Fedora service-based architecture has led to its deployment in a variety of domains including digital libraries =-=[35, 57]-=-, institutional repositories [53], electronic records archives [63], trusted repositories for digital preservation [33], library systems [62], educational technologies [56], web publishing [23], and d...

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...a in an educational digital library like the National Science Digital Library [64]. • Modeling more complex forms of network overlays over the resources in a content repository such as citation links =-=[29, 31]-=-, link structure, friend of a friend [7], etc. All of these relationships, including structural relationships, should be expressible both within individual digital objects and among multiple digital o...

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...ntext of the NSF-funded Prism Project [2]. This prototype provided the context for a variety of research initiatives most notably in the areas of fine-grained policy enforcement [43] and preservation =-=[44]-=-. The transition of Fedora from a research prototype to production repository software began when the University of Virginia Library, seeking a solution for managing increasingly complex digital conte...

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...t the Los Alamos National Laboratory research library. The aDORe system provides a standards-based repository for managing and accessing complex digital objects. Objects are encoded in XML using DIDL =-=[21]-=- and a limited set of object relationships can be expressed using RDF. Object dissemination services are available via OAI-PMH [38] and OpenURL [40], The current release of Fedora is version 2.0, whic...

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...ed digital library architecture with protocol-based dissemination of digital objects in multiple formats. Follow-on research extended these initial concepts with the notion of active digital objects =-=[26]-=- and distributed active relationships [25]. These concepts were refined and prototyped in a CORBA-based Fedora (Flexible Extensible Digital Object Repository Architecture) [42] as part of research wit...

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...rk for creation and management of existing and evolving forms of digitalscontent. The roots of the project lie in DARPA-funded research in the early 1990’s that defined the notion of a digital object =-=[26]-=- and implemented Dienst [27], a networked digital library architecture with protocol-based dissemination of digital objects in multiple formats. Follow-on research extended these initial concepts with...

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...mplates that correspond to well-known physical artifacts such as a book composed of chapters and diaries consisting of entries. The current exemplar of this encoding of structural metadata is in METS =-=[15]-=-. Our focus in Fedora has been to decompose these structural units into separate digital objects. The motivation for this is that the units can then be reused in a variety of structural compositions. ...

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...dora digital object model and extensibility of the Fedora service-based architecture has led to its deployment in a variety of domains including digital libraries [35, 57], institutional repositories =-=[53]-=-, electronic records archives [63], trusted repositories for digital preservation [33], library systems [62], educational technologies [56], web publishing [23], and distributed information networks [...

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...mat (FOXML). Future releases will support MPEG-21 DIDL and possible other formats.sAs a service-based architecture for complex digital objects, Fedora has some commonality with the aDORe architecture =-=[59]-=- developed at the Los Alamos National Laboratory research library. The aDORe system provides a standards-based repository for managing and accessing complex digital objects. Objects are encoded in XML...

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...], electronic records archives [63], trusted repositories for digital preservation [33], library systems [62], educational technologies [56], web publishing [23], and distributed information networks =-=[37]-=-. Fedora is implemented as a set of web services that provide full programmatic management of digital objects as well and search and access to multiple representations of objects. All Fedora APIs are ...

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...NRI [41] and in the context of the NSF-funded Prism Project [2]. This prototype provided the context for a variety of research initiatives most notably in the areas of fine-grained policy enforcement =-=[43]-=- and preservation [44]. The transition of Fedora from a research prototype to production repository software began when the University of Virginia Library, seeking a solution for managing increasingly...

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...king a solution for managing increasingly complex digital content, experimented with the Fedora architecture [51]. This experimentation took place in the context of innovations in humanities research =-=[58]-=-. The experimentation proved successful, providing the basis for subsequent funding from the Andrew W. Mellon Foundation to Cornell and Virginia [45] to jointly develop Fedora and make it available as...

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...nsibility of the Fedora service-based architecture has led to its deployment in a variety of domains including digital libraries [35, 57], institutional repositories [53], electronic records archives =-=[63]-=-, trusted repositories for digital preservation [33], library systems [62], educational technologies [56], web publishing [23], and distributed information networks [37]. Fedora is implemented as a se...

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...des parameterized query access to the relationships defined for that object. Such a query might return the “members of a collection” or, in the case of an educational digital library such as the NSDL =-=[52]-=-, the set of resources that are appropriate for K-12 mathematics education. The implementation of these queries is described in Section 4. 2.4 Functional View III – Object Integrity Components The Fed...