iiWAS - Towards Context-Based Tracking of Web Services Security.

With the increasing popularity of Web services and increasing complexity of users\u27 needs, there has been a renewed interest in Web services composition. However, composition faces a major obstacle, which is the content heterogeneity of the contexts featuring the component Web services of a composite service. An unawareness or poor consideration of this heterogeneity during Web services composition and execution definitely results in a lack of the quality and relevancy of information that is deemed appropriate for tracking the composition, monitoring the execution, and handling exceptions. An earlier paper had provided a 3-level approach for content reconciliation of Web services\u27 contexts using ontologies. This paper extends the 3-level approach by focusing on the security breaches that threaten the integrity of the context of Web services, and proposes appropriate means to achieve this integrity

An approach to engineer communities of web services: Concepts, architecture, operation, and deployment

This article presents an approach that provides the necessary assistance to those who are in charge of engineering communities of Web services. Current practices indicate that Web services providing the same functionality are gathered into one community, independently of their origins and the way they carry out this functionality. The provided assistance manifests itself with the concepts to use, the architecture to select, the operations to script, and the deployment to track. Two protocols frame the interactions in an environment of communities of Web services namely the Web Services Community Development Protocol and the Contract-Net Protocol. The former manages a community in terms of Web services attraction/registration/withdrawal to/with/from this community. The latter satisfies users\u27 needs in terms of Web services selection/ contracting/ triggering. Finally, the article presents a prototype illustrating the engineering approach with focus on Web services attraction. Copyright © 2009, IGI Global

Engineering Communities of Web services

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A Framework for Modeling B2B Applications

This paper presents a Web services-based framework for modeling Business-to-Business (B2B) applications. This framework consists of three levels namely strategic, application, and resource, with focus here on the first two levels. The strategic level is about the common vision that independent businesses define as part of their decision to join forces. And the application level is about the business processes that get virtually integrated as result of this common vision. To implement the strategic and application levels, this paper leverages from our earlier two projects referred to as Context-Aware Web Services and Coordination Model for Web Services, respectively. Hence in line with these projects we model B2B applications as context-aware Web services. Context-based modeling is used for modeling and tracking interactions among B2B applications, with emphasis on how conflicts among the applications are identified and managed. The application of our framework to a BlB scenario relies on a casestudy from the purchasing domain. We also present a prototype implementation of our framework on this domain. © 2008 IEEE

Engineering Communities of Web services

International audienceLater onPlus tar

Direct data transfer between SOAP web services in orchestration

In scientific data analysis, workflows are used to integrate and coordinate resources such as databases and tools. Workflows are normally executed by an orchestrator that invokes component services and mediates data transport between them. Scientific data are frequently large, and brokering large data increases the load on the orchestrator and reduces workflow performance. To remedy this problem, we demonstrate how plain SOAP web services can be tailored to support direct service-to-service data transport, thus allowing the orchestrator to delegate the data-flow. We formally define a data-flow delegation message, develop an XML schema for it, and analyze performance improvement of data-flow delegation empirically in comparison with the regular orchestration using an example bioinformatics workflow

Policies for Context-Driven Transactional Web Services

Abstract This paper presents an approach that uses policies to manage contextdriven transactional Web services. Context feeds policies with details on Web services like current status, which permits aligning the behavior of these Web services to the transactional properties they need to satisfy. Context refers here to any information on the interactions a Web service initiates with peers and external environment. Three types of transactional properties are used namely pivot, compensatable, and retriable. Each property satisfaction calls for a set of policies that are specified with a policy language like WSPL. This paper also presents the adaptation strategy that supports developing context-driven transactional Web services. A prototype that implements this strategy is discussed in the paper, too