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Service constraints are usage restrictions on service features that are imposed by service providers. Such constraints need to be verified prior to the execution of a service in order to ensure correct service execution. In the case of composite services, the set of applicable constraints is derived from the service constraints defined over the individual service components that are part of the service...
Web service composition involves a collection of web services; the interaction among the participating services makes the testing of the web service composition significantly complicated. In this paper, we present an approach of test case generation for Business Process Execution Language (BPEL) based web service composition using Colored Petri Net (CPN) which provides a strong formal background for...
Service composition can be considered as a Linked Data model due to the way that each one of the services that make up the composition is structured. For doing this, a service composer is required in order to evaluate the input and output data of various web-distributed services for linking them. These links can be analyzed from a quality perspective in which a service may fail when it does not fulfill...
Along with web service composition becomes more and more complexity, design of composition process becomes more and more error-prone. In this article we put forward a WSC_ECPN model for web service composition description based on extended colored Petri net. This model is independent of any concrete process description languages, supports process description and can describe composition process more...
In many cases, a single Web service can't meet the needs of users, so Web service composition becomes an important issue. As the Web service increases rapidly, it is more and more important to find an auto composition technology. At present most CPN-based composition technologies establish CPN model, but these methods don't take full advantage of CPN tools to resolve the composition. In this paper,...
Existing Web service access control models focus on individual Web services, and do not consider service composition. In composite services, a major issue is information flow control. Critical information may flow from one service to another in a service chain through requests and responses and there is no mechanism for verifying that the flow complies with the access control policies. In this paper,...
Automatic Web services composition has attracted much attention in recent years with the focus on control flow specification. Data mismatch between WSs is often considered as an orthogonal problem that can be solved using XML data model and query languages, e.g., XQuery . We argue that Web services composition and data manipulation should be considered holistically such that further optimization on...
The ability to build new (complex) services by composing existing services is one of the key benefits of the Service Oriented Architecture paradigm. Existing approaches to automate composition requires pre-planning or prediction of the number of required services, making them unsuitable in dynamic composition scenarios. To address this gap, we present a consistency-based service composition approach,...
Geospatial information services composition is a promising approach to construct complex Web GIS applications. BPEL, which is the language and the industry standard that expresses complex concurrent business processes for Web services composition, is efficient at composing the geospatial information services chain. This paper concludes the BPEL control flows to four basic models which can be applied...
The Business Process Execution Language for Web Services (BPEL4WS) is the de facto standard for the composition of Web services into complex, valued-added workflows in both industry and academia. Since the composition of Web services into a workflow is challenging and error-prone, several graphical BPEL4WS workflow editors have been developed. These tools focus on the composition process and the visualization...
One under-addressed issue in the field of Web services composition is authentication between disparate services using different authentication methods or protocols. A single sign-on (SSO) framework reduces the burden on the end user to provide authentication credentials to these separate services; thus it is a desirable feature for systems and applications that are based on multiple Web services....
Web service composition can be facilitated by an automatic process which consists of rules, conditions and actions. This research has adapted ElementaryPetri Net (EPN) to analyze and model the web services and their composition. This paper describes a set of techniques for representing transition rules, algorithm and workflow that web service composition can be automatically carried out.
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