Abstract The mediation is based on an essential component called mediator. The main role of the mediator is to reformulate a user query, written in terms of global schema, in queries written in terms of sources schemas. This paper describes an algorithm for reformulation of XQuery queries. The algorithm is based on the principle of logical equivalence, simple and complex unification,... The mediation is based on an essential component called mediator. The main role of the mediator is to reformulate a user query, written in terms of global schema, in queries written in terms of sources schemas. This paper describes an algorithm for reformulation of XQuery queries. The algorithm is based on the principle of logical equivalence, simple and complex unification, to obtain a better reformulation. It takes as parameter the query XQuery, the global schema (written in XMLSchema), mappings GLAV and gives as a result a query written in terms of sources schemas. The results of implementation show the proper functioning of the algorithm. Read More Read Less

Abstract Data streams are becoming an important concept and used in more and more applications. Processing of data streams needs a streaming engine. The streaming engine can start query processing once initial data is available. This capability is especially important for real-time computation and for long-relay transmission of data streams. In this work, we demonstrate a monitoring system of eBay auctions,... Data streams are becoming an important concept and used in more and more applications. Processing of data streams needs a streaming engine. The streaming engine can start query processing once initial data is available. This capability is especially important for real-time computation and for long-relay transmission of data streams. In this work, we demonstrate a monitoring system of eBay auctions, which is based on our RDF stream engine and can analyze eBay auctions in a flexible way. Using our monitoring system, users can easily monitor the eBay auctions information of interest, analyze the behavior of buyers and sellers, predict the tendency of auctions and make more favorable decisions. Furthermore, each step during RDF stream processing can be visualized allowing a better and easier understanding of the internal processes. This paper is an extended version of [22]. Read More Read Less

Abstract The personalization in information retrieval has for goal to provide applicable information that corresponds precisely to the user’s needs. In this paper, we are interested in creating a “Personalized Information Retrieval System In a Digital Library” called PIRSIDIL in order to present to the current user relevant retrieved documents adapted to their centers of interests and their needs. To achieve... The personalization in information retrieval has for goal to provide applicable information that corresponds precisely to the user’s needs. In this paper, we are interested in creating a “Personalized Information Retrieval System In a Digital Library” called PIRSIDIL in order to present to the current user relevant retrieved documents adapted to their centers of interests and their needs. To achieve this goal, we are interested in modeling the user profile and in describing the metadata of documents and use them in the matching. The first experimental evaluations show a significant improvement of results offered by our system compared to Google. Read More Read Less

Abstract Modelling business processes using BPMN has been emerging as the preferred choice for organisations seeking to enact their business processes in service-oriented environments. However, a number of organisations have their business processes modelled using Role Activity Diagramming, RAD. In this research, we introduce a new approach to translating RAD business process models to their respective BPMN ones carried out in... Modelling business processes using BPMN has been emerging as the preferred choice for organisations seeking to enact their business processes in service-oriented environments. However, a number of organisations have their business processes modelled using Role Activity Diagramming, RAD. In this research, we introduce a new approach to translating RAD business process models to their respective BPMN ones carried out in two stages starting from identifying the corresponding BPMN notation to RAD modelling constructs, and then introducing a new algorithm to translate a given RAD business process model to its suggested corresponding BPMN model demonstrated by an example from the healthcare domain. This translation revealed that all RAD process elements can be mapped to BMPN. However, there still remains space for the business process modeller to enhance the newly generated BPMN model with the extra rich features of BPMN. Finally, this work makes a further contribution to the emerging trend of bridging the gap between business process models and systems in addition to paving the way for the migration of legacy RAD models to BPMN for their enactment in SOA environments. Read More Read Less

Abstract In this review, we address the importance of field i.e. Middleware Technology; a mediate between more than one distributed web application and client based desktop application for efficient data exchange and resource sharing. While describing the technological contributions of Middleware Technologies in detail, we present some of its major technologies i.e. Web Service, GRID Computing, Open Service Grid Infrastructure, which... In this review, we address the importance of field i.e. Middleware Technology; a mediate between more than one distributed web application and client based desktop application for efficient data exchange and resource sharing. While describing the technological contributions of Middleware Technologies in detail, we present some of its major technologies i.e. Web Service, GRID Computing, Open Service Grid Infrastructure, which are involved in web, embedded and enterprise application development e.g. Portals, E-Science and E-Learning Platforms, Games etc. Furthermore, in this review paper, we present new Middleware Technology concepts i.e. Web Grid Service and Chain Web Grid Service. Going into the details, we present the conceptual architecture of newly proposed concepts along with information of implementation using existing web technologies, scripts and programming languages. Read More Read Less