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This thesis presents practical suggestions towards the implementation of thehyperset approach to semi-structured databases and the associated querylanguage Delta. This work can be characterised as part of a top-down approachto semi-structured databases, from theory to practice. The main original partof this work consisted in implementation of the hyperset Delta query languageto semi-structured databases, including worked example queries. In fact, thegoal was to demonstrate the practical details of this approach and language.The required development of an extended, practical version of the languagebased on the existing theoretical version, and the corresponding operationalsemantics. Here we present detailed description of the most essential steps ofthe implementation. Another crucial problem for this approach was todemonstrate how to deal in reality with the concept of the equality relationbetween (hyper)sets, which is computationally realised by the bisimulationrelation. In fact, this expensive procedure, especially in the case ofdistributed semi-structured data, required some additional theoreticalconsiderations and practical suggestions for efficient implementation. To thisend the 'local/global' strategy for computing the bisimulation relation overdistributed semi-structured data was developed and its efficiency wasexperimentally confirmed.

Hyperset Approach to Semi-structured Databases and the Experimental Implementation of the Query Language Delta