Consistency and currency in functional databases

technical reportWe consider a hybrid model of databases, in which a functional component T is defined as an extension to an imperative component B. T. is loosely coupled to B through a highly parallel function network N. which provides a simple failsafe test of whether an existing assignment of values to a given view (subset) T' of T is consistent. If this test fails, or when a "current" view of T' is desired, N can be requested to "refresh" T' so that its values become consistent with respect to the current assignment to B. These requests are serviced by N without danger of system deadlock

Context constraint integration and validation in dynamic web service compositions

System architectures that cross organisational boundaries are usually implemented based on Web service technologies due to their inherent interoperability benets. With increasing exibility requirements, such as on-demand service provision, a dynamic approach to service architecture focussing on composition at runtime is needed. The possibility of technical faults, but also violations of functional and semantic constraints require a comprehensive notion of context that captures composition-relevant aspects. Context-aware techniques are consequently required to support constraint validation for dynamic service composition. We present techniques to respond to problems occurring during the execution of dynamically composed Web services implemented in WS-BPEL. A notion of context { covering physical and contractual faults and violations { is used to safeguard composed service executions dynamically. Our aim is to present an architectural framework from an application-oriented perspective, addressing practical considerations of a technical framework

Towards improved performance and interoperability in distributed and physical union catalogues

Purpose of this paper: This paper details research undertaken to determine the key differences in the performance of certain centralised (physical) and distributed (virtual) bibliographic catalogue services, and to suggest strategies for improving interoperability and performance in, and between, physical and virtual models. Design/methodology/approach: Methodically defined searches of a centralised catalogue service and selected distributed catalogues were conducted using the Z39.50 information retrieval protocol, allowing search types to be semantically defined. The methodology also entailed the use of two workshops comprising systems librarians and cataloguers to inform suggested strategies for improving performance and interoperability within both environments. Findings: Technical interoperability was permitted easily between centralised and distributed models, however the various individual configurations permitted only limited semantic interoperability. Significant prescription in cataloguing and indexing guidelines, greater participation in the Program for Collaborative Cataloging (PCC), consideration of future 'FRBR' migration, and greater disclosure to end users are some of the suggested strategies to improve performance and semantic interoperability. Practical implications: This paper informs the LIS research community and union catalogue administrators, but also has numerous practical implications for those establishing distributed systems based on Z39.50 and SRW, as well as those establishing centralised systems. What is original/value of the paper?: The paper moves the discussion of Z39.50 based systems away from anecdotal evidence and provides recommendations based on testing and is intimately informed by the UK cataloguing and systems librarian community

A survey of UK university web management: staffing, systems and issues

Purpose: The purpose of the paper is to summarize the findings of a survey of UK universities about how their web site is managed and resourced, which technologies are in use and what are seen as the main issues and priorities. Methodology/approach: The paper is based on a web based questionnaire distributed in summer 2006, and which received 104 usable responses from 87 insitutions. Findings: The survey showed that some web teams were based in IT and some in external relations, yet in both cases the site typically served internal and external audiences. The role of web manager is partly management of resources, time and people, partly about marketing and liaison and partly also concerned with more technical aspects including interface design and HTML. But it is a diverse role with a wide spread of responsibilities. On the whole web teams were relatively small. Three quarters of responding institutions had a CMS, but specific systems in use were diverse. 60% had a portal. There was evidence of increasing use of blogs and wikis. The key driver for the web site is student recruitment, with instituitional reputation and information to stakeholders also being important. The biggest perceived weaknesses were maintaining consistency with devolved content creation and currency of content; lack of resourcing a key threat while comprehensiveness was a key strength. Current and wished for projects pointed again to the diversity of the sector. Research implications/limitations: The lack of comparative data and difficulties of interpreting responses to closed questions where respondents could have quite different status (partly reflecting divergent patterns of governance of the web across the sector) create issues with the reliability of the research. Practical implications: Data about resourcing of web management, technology in use etc at comparable institutions is invaluable for practitioners in their efforts to gain resource in their own context. Originality/value of paper: The paper adds more systematic, current data to our limited knowledge about how university web sites are managed

A procedure for mediation of queries to sources in disparate contexts

Includes bibliographical references (p. 17-19).S. Bressan ... [et al.]

Corpora and evaluation tools for multilingual named entity grammar development

We present an effort for the development of multilingual named entity grammars in a unification-based finite-state formalism (SProUT). Following an extended version of the MUC7 standard, we have developed Named Entity Recognition grammars for German, Chinese, Japanese, French, Spanish, English, and Czech. The grammars recognize person names, organizations, geographical locations, currency, time and date expressions. Subgrammars and gazetteers are shared as much as possible for the grammars of the different languages. Multilingual corpora from the business domain are used for grammar development and evaluation. The annotation format (named entity and other linguistic information) is described. We present an evaluation tool which provides detailed statistics and diagnostics, allows for partial matching of annotations, and supports user-defined mappings between different annotation and grammar output formats