Interactions between two applications encapsulated into Web services consist in series of message exchanges that must conform to service interfaces. The study reported in this text aims at dealing with the issues that arise when interactions between two services (a client and a provider) fail because their interfaces are incompatible. This may happen because the provider has evolved and its interface has been modified. It may also happen because the client decided to change for another provider which addresses the same needs but offers a different interface. The contribution of the proposed approach is twofold. First, given two services, all incompatibilities that may exist between their interfaces are automatically detected and classified into patterns. Second, according to the patterns that have been recognized, an adapter is then automatically generated. This latter is intended to act as an intermediate between the client and the provider, therefore seamlessly reconciling interactions between them.

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This paper presents a Web services composition approach that is built upon three layers known as component, community, and composite. The contribution of each layer towards this approach is assessed from two perspectives known as organization and management. Furthermore this paper discusses how Web services in a community are specialized into abstract and concrete. Interactions between abstract/- concrete Web services and composite Web services happen through a driver known as Open Service Connectivity. This driver permits first, binding any abstract Web service to any composite Web service and second, triggering any concrete Web service from any composite Web service.

This paper presents an approach whose objective is to support Web services substitution. Substitution means replacing a component with another component, as long as the replacing component produces the same output and satisfies the same requirements as the replaced component. Motives for substitution include Web service's non-responsiveness to client requests and better arrangement with another, competitor Web service. To perform Web services substitution with less impact on the ongoing, and sometimes critical, business processes, the approach proposes deploying communities of Web services. A community promotes the dynamic binding of Web services through a common interface, known as open service connectivity. The open service connectivity directs requests to and responses from Web services regardless of how these latter are specified, implemented, and located

We present TEMPOS: a set of models and languages supporting the manipulation of temporal data on top of object DBMS. The proposed models exploit object-oriented technology to meet some important, yet traditionally neglected design criteria related to legacy code migration and representation independence. Two complementary ways for accessing temporal data are offered: a query language and a visual browser. The query language, namely TEMPOQL, is an extension of OQL supporting the manipulation of histories regardless of their representations, through fully composable functional operators. The visual browser offers operators that facilitate several time-related interactive navigation tasks, such as studying a snapshot of a collection of objects at a given instant, or detecting and examining changes within temporal attributes and relationships. TEMPOS models and languages have been formalized both at the syntactical and the semantical level and have been implemented on top of an object DBMS. The suitability of the proposals with regard to applications' requirements has been validated through concrete case studies.

This paper presents a language for expressing temporal pattern-matching queries, and a set of temporal grouping operators for structuring histories following calendar-based criteria. Pattern-matching queries are shown to be useful for reasoning about successive events in time while temporal grouping may be either used to aggregate data along the time dimension or to display histories. The combination of these capabilities allows to express complex queries involving succession in time and calendar-based conditions simultaneously. These operators are embedded into the TEMPOS temporal data model and their use is illustrated through examples taken from a geographical application. The proposal has been validated by a prototype on top of the O 2 DBMS. Keywords: temporal databases, temporal object model, temporal query language, pattern-matching queries, temporal grouping, calendar, granularity, O 2 . 1 Introduction In most modern DBMS, time is one of the primitive datatypes provided for d...