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XML has become a defacto standard for storing, sharing and exchanging information across heterogeneous platforms. The XML content is growing day by day in rapid pace. Enterprises need to make queries on XML databases frequently. As huge XML data is available, it is challenging task to extract required data from XML database. It is computationally expensive(More)
The role of the eXtensible Markup Language (XML) is becoming very important in the research fields focusing on the representation, the exchange, and the integration of information coming from different data sources and containing information related to various contexts such as, for example, medical and biological data. Extracting knowledge from XML datasets(More)
Context-aware systems are pervading everyday life, therefore context modeling is becoming a relevant issue and an expanding research field. This survey has the goal to provide a comprehensive evaluation framework, allowing application designers to compare context models with respect to a given target application; in particular we stress the analysis of(More)
Common to all aCtors in today's information world is the problem of lowering the " information noise, " both reducing the amount of data to be stored and accessed, and enhancing the " precision " according to which the available data fit the application requirements. Thus, fitting data to the application needs is tantamount to fitting a dress to a person,(More)
The widespread use of mobile appliances, with limitations in terms of storage, power, and connectivity capability, requires to minimize the amount of data to be loaded on user's devices, in order to quickly select only the information that is really relevant for the users in their current contexts: in such a scenario, specific methodologies and techniques(More)
More and more often, we face the necessity of extracting appropriately reshaped knowledge from an integrated representation of the information space. Be such a global representation a central database, a global view of several ones or an ontological representation of an information domain, we face the need to define personalised views for the knowledge(More)
This paper presents a methodology to derive views over a relational database by applying a sequence of appropriately defined operations to the global schema. Such tailoring and composition process aims at offering personalized views over the database schema, so as to improve its ability to support the new needs of customers, support evolutionary software(More)