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XML is universally recognized as the standard document format for the purpose of interchange and device-independent presentation. Literature shows many eeorts towards the development of formal and conceptual models for XML, although no commonly accepted model exists as yet. In this paper, we present a s u r v ey of some formal and conceptual modeling(More)
Being able to express and enforce role-based access control on XML data is a critical component of XML data management. However, given the semi-structured nature of XML, this is non-trivial, as access control can be applied on the values of nodes as well as on the structural relationship between nodes. In this context, we adopt and extend a graph editing(More)
The WWW has a great potential of evolving into a globally distributed digital document library.The primary use of such a library is to retrieve information quickly and easily. Because of the size of these libraries , simple keyword searches often result in too many matches. More complex searches involving boolean expressions are diicult to formulate and(More)
When describing Web services, one of the obvious aspects that needs representing is Quality of Service " (QoS), the capability of a Web service to meet an acceptable level of service as per factors such as availability and accessibility. However too much of a focus on developing functional QoS ontologies has led to an over-emphasis on representing solely(More)
Sharing data between organizations is challenging because it is difficult to ensure that those consuming the data accurately interpret it. The promise of the next generation WWW, the semantic Web, is that semantics about shared data will be represented in ontologies and available for automatic and accurate machine processing of data. Thus, there is(More)
Acknowledgements So very many people have touched my life over the course of this odyssey. For those that may escape mention here|a dissertation in itself|I have made the last to be rst, and I perhaps owe you a drink. Resounding thanks and a c horus of gratitude to my advisor, David Leake, for all of his support, guidance, and encouragement. David has(More)