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The paper aims to present the concept of the functionality of metadata harvesting for regional digital libraries, based on the OAI‐PMH protocol. This functionality is a part of regional digital libraries platform created in Poland. The platform was required to reach one of main objectives of the Polish PIONIER Programme – to enrich the content‐based services in the Polish NREN.

In order to create the regional digital libraries platform with metadata harvesting feature, digital library low‐level services provided by the dLibra Digital Library Framework in a service‐oriented architecture (SOA) are deployed. The approach for defining the set of services started with splitting the whole set of advanced digital library features into coherent functional groups, which covered functionality related to digital content, metadata, searching, etc. Then each functional group implicated the creation of a respective digital library service. Additionally, a couple of supporting services like “system” or “event services” were defined.

The exploration of metadata and information about libraries' structure enables the creation of higher‐level, content‐based services like virtual collections or metadata searching, which are described in the paper. The approach for building distributed regional digital libraries in the National Research and Education Network is suitable for larger scale systems, like international digital libraries. This issue is very important for research networking, especially in the context of European Commission's announcement promoting digital access to Europe's heritage through the European Digital Library.

The implementation of the communication protocol between different instances of digital libraries is the basis for the development of content‐based services. It presents examples of such services that are enabled through the PIONIER platform for distributed regional digital libraries, and that are provided for research and education users. The next step that will allow for the creation of even more sophisticated services, will offer the possibility to search through content gathered in PIONIER digital libraries. This will be achieved by combining the OAI‐PMH protocol together with the MPEG‐21 DIDL standard for the exchange of the digital content and content‐related metadata. Another group of complementary services also covers information services provided by grid environments.

The installation of regional digital libraries in the PIONIER network is currently providing access to more than 15,000 of digital publications. This paper presents a working implementation of the communication between digital libraries in the sense of the exploration of metadata and information about the library structure. This service is seen by us as one of the crucial mechanisms of the information infrastructure, which provides access to scientific and cultural content as well as common middleware services, which should be both distributed and platform‐independent.

The paper is providing the case study for those who are building the large‐scale distributed digital library systems. The definition of services based on metadata harvesting provides an example of core digital library services, which are transforming digital libraries into digital infrastructure for social sciences.

This paper aims to study integrated metadata access infrastructure for a network of federated curated data repositories. With the increase in collaborative initiatives among diverse scientific discipline, infrastructure should be in place to facilitate effective information sharing. Scientific data sharing involves provisioning, curation and dissemination of information about the various datasets for discovery and access by other peers, which is achieved using metadata services. The heterogeneous nature of various distributed dataset repositories has resulted in the use of heterogeneous metadata services. This poses some challenges in efficient dataset sharing and information retrieval. To allow for universal accessibility of these autonomous curated data repositories, it is important to establish cross-integration on these data repositories for information sharing.

The authors address this problem through provisioning of a universal metadata interface design that can be integrated with some popular metadata services such as integrated rule-oriented data system (iRODS), OpenDap/THREDDS and MERCURY. Given a network of federated heterogeneous distributed metadata services over autonomous curated data repositories, the authors present an implementation of a universal interface system that can probe and query different metadata databases to access the essential information provided for data discovery and enable data migration.

The authors present the architecture that integrates and allows communication between our interface and the various autonomous data repositories. The authors show how they can integrate their system with THREDDS and iRODS to accomplish data discovery and access operations without altering the implementations of the metadata services at their remote locations.

Their system provides unique architecture for information discovery and metadata searches which employs the application programming interfaces for the respective metadata services and communicates using the Zero C Internet communication engine (ICE) protocol.

As the demand for new services strains library resources, directors of research libraries must practice efficient cost management and demonstrate alignment with institutional objectives. For technical services, this requires managing the effective cost of metadata services, assessing core functions, and evaluating operational performance. This paper uses Complex Adaptive Systems (CASs) as a framework to expose the network of local and global dependencies that currently define the field of operation for technical services. Comparative analyses using a CASs framework were conducted on reports by the Library of Congress, the Heads of Technical Services in Large Research Libraries Interest Group, and the British Library. Each report addresses financial pressures placed on bibliographic control services in response to the 2008 recession. Statements within the reports were assigned to one of three dominant systems: bibliographic control, institutional identification, and distributive networks. The statements were then mapped to the CASs characteristics to determine environmental pressures and areas of adaptation. The reports exposed long-standing dependencies that tie local bibliographic control to a complex network of external agencies. Institutional shifts toward user-centered services coupled with growing fiscal restraint has disrupted the stability of these networks. The analyses found that in all cases network instability led to localized institutional adaptation to existing economic pressures. The paper recommends applying a CASs model to assess the alignment of distributed metadata standards and systems development to local institutional objectives.

The purpose of this paper is to present the architectural principles and the services of the D-NET software toolkit. D-NET is a framework where designers and developers find the tools for constructing and operating aggregative infrastructures (systems for aggregating data sources with heterogeneous data models and technologies) in a cost-effective way. Designers and developers can select from a variety of D-NET data management services, can configure them to handle data according to given data models, and can construct autonomic workflows to obtain personalized aggregative infrastructures.

The paper provides a definition of aggregative infrastructures, sketching architecture, and components, as inspired by real-case examples. It then describes the limits of current solutions, which find their lacks in the realization and maintenance costs of such complex software. Finally, it proposes D-NET as an optimal solution for designers and developers willing to realize aggregative infrastructures. The D-NET architecture and services are presented, drawing a parallel with the ones of aggregative infrastructures. Finally, real-cases of D-NET are presented, to show-case the statement above.

The D-NET software toolkit is a general-purpose service-oriented framework where designers can construct customized, robust, scalable, autonomic aggregative infrastructures in a cost-effective way. D-NET is today adopted by several EC projects, national consortia and communities to create customized infrastructures under diverse application domains, and other organizations are enquiring for or are experimenting its adoption. Its customizability and extendibility make D-NET a suitable candidate for creating aggregative infrastructures mediating between different scientific domains and therefore supporting multi-disciplinary research.

D-NET is the first general-purpose framework of this kind. Other solutions are available in the literature but focus on specific use-cases and therefore suffer from the limited re-use in different contexts. Due to its maturity, D-NET can also be used by third-party organizations, not necessarily involved in the software design and maintenance.

This paper describes emerging metadata practice and standards. It gives an overview of the environments in which metadata is used, before focusing on metadata for information resources. It outlines an approximate typology of approaches and explores different strands of metadata activity. It discusses trends in format development, metadata management, and use of search and retrieve protocols. It concludes by discussing some features of future deployment of metadata in support of network resource discovery.

In the fall of 2002, the University of Illinois Library at Urbana‐Champaign received a grant from the Institute of Museum and Library Services (IMLS) to implement a collection registry and item‐level metadata repository for digital collections and content created by or associated with projects funded under the IMLS National Leadership Grant (NLG) program. When built, the registry and metadata repository will facilitate retrieval of information about digital content related to past and present NLG projects. The process of creating these services also is allowing us to research and gain insight into the many issues associated with implementing such services and the magnitude of the potential benefit and utility of such services as a way to connect, bring together, and make more visible a broad range of heterogeneous digital content. This paper describes the genesis of the project, the rationale for architectural design decisions, challenges faced, and our progress to date.

This paper aims to describe the main challenges of identifying and accessing useful information and knowledge about natural hazards and disasters results. The paper presents a grid‐based digital library system designed to address the challenges.

The need to organize and publish metadata about European research results in the field of natural disasters has been met with the help of two innovative technologies: the Open Grid Service Architecture (OGSA) and the Resource Description Framework (RDF). OGSA provides a common platform for sharing distributed metadata securely. RDF facilitates the creation and exchange of metadata.

Using grid technology allows the RDF metadata of European research results in the field of natural disasters to be shared securely and effectively in a heterogeneous network environment.

A metadata approach is proposed for the extraction of the metadata, and their distribution to third parties in batch, and their sharing with other applications can be a quickly process. Furthermore, a method is set out to describe metadata in a common and open format, which can become a widely accepted standard; the existence of a common standard enables the metadata storage in different platforms while supporting the capability of distributed queries across different metadata databases, the integration of metadata extracted from different sources, etc. It can be used for the general‐purpose search engines.

The purpose of this article is to review metadata issues identified in recent research carried out in Scotland on services based on metadata aggregation via OAI‐PMH, and to examine the role of collection‐level description in managing ingest to harvested repositories, subsequent harvesting by secondary aggregators, and the contextualisation of institutional and aggregated repositories in the wider information retrieval environment.

The paper reviews the output of several projects involving institutional repositories and collection‐level description in Scotland.

Collection‐level description is a useful tool for aggregator services, but further work is required to accommodate information about the manipulation of metadata sets. Communities need to consider how best to incorporate structured collection information within the OAI‐PMH for their specific purposes.

The paper shows the importance of recent developments in collection description metadata for implementors of OAI‐PMH services, building on the simple placeholders for such metadata allowed by the protocol.

The MetaScholar Initiative is a collaborative endeavor to explore the feasibility and utility of scholarly portal services developed in conjunction with Open Archives Initiative (OAI) metadata harvesting technologies. The MetaScholar Initiative comprises two projects, the MetaArchive and AmericanSouth projects, both funded by grants from the Andrew W. Mellon Foundation totaling $600,000. These two projects have created two metadata aggregation networks connecting some 24 libraries, archives, museums, and electronic text centers. Each network has an associated portal being created under the guidance of teams composed of scholars, librarians, archivists, and technologists. The MetaScholar Initiative is studying issues such as metadata normalization, alternative forms of scholarly communication through portals, and the process of facilitating smaller archival institutions in providing better access to their collections through the OAI Protocol for Metadata Harvesting (OAI‐PMH). The MetaScholar Initiative is based at Emory University in Atlanta, Georgia.

The purpose of this paper is to explore addressing the accessibility, availability and interoperability issues of exchanging agricultural research output by means of the AGRIS application profile – an exchange metadata standard – and controlled vocabularies or subject‐specific knowledge organisation systems.

Based on an analysis of the open access (OA) publishing model and the open archives initiative (OAI), the authors share their proposal for the architecture for open archive networks in agricultural sciences and technology.

The lack of adequate information exchange possibilities between researchers in food and agricultural sciences represents a significant weakness, limiting the research system to properly help address the issues of agricultural development. The OA publishing model promotes the availability of content online, including grey literature, which is not available through commercial distribution channels but which significantly contributes to agricultural research and development. The new architecture proposed in this paper is based on these OA and OAI paradigms and has three components: the creation of content with agreed content description standards, the harvesting of the content using common exchange standards and the value‐added services provided to the users using the exchanged standard content.

The paper presents how the agricultural sciences and technology community can adopt the OA model and OAI tools. The paper will be useful to information professionals who are planning to improve the accessibility and interoperability of the agricultural research produced in their institution by the creation of institutional repositories.