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• W91094420 abstract "AbstractThe integration of Web services and Web applications offers challenging opportunities to academic andindustrial research; the relevant issues include new methods, paradigms, and standards for support-ing Web services and their composition. This paper focuses on the specification of Web applicationsthat compose Web services in order to support arbitrarily complex processes. The proposed approachextends a high-level modeling language, called WebML, used for the specification of the front-end ofWeb applications. We develop two orthogonal extensions for the inclusion of Web services inside Webapplications, accompanied by suitable protocols for message exchange, and the empowerment of Webmodeling primitives with workflow capabilities. The combined use of these two features gives to WebMLenough expressive power for specifying complex Web service interactions. 1 Introduction In modern Web applications, most pages are dynamically composed from content extracted from corporatedatabases, and the business logic is based upon several interacting components. The design of ”data-intensiveWeb applications”, i.e., of Web applications making extensive use of databases, takes advantage of declarativeWeb site specification and modeling languages, such as WebML [4], capable of producing high-level, unifieddescriptions of the data and front-end requirements of the application. While such specifications adequatelycover the needs of applications developed within a single organization, they do not cover well the integrationof Web applications with externally provided business logic. Nowadays, the concept of Web service is gainingpopularity as a uniform interface for distributed software components, and several related standards and toolsare being proposed for wide-scale interoperability.This paper addresses the design and specification of data- and service-intensive Web applications, leveraging anexisting visual language for modeling data-intensive Web sites, and applies the benefits of high-level, declarativespecification to the combined use of data and services. In order to represent the Web services behavior, we pro-vide a set of graphical primitives that represent the services and allow one to compose services and hypertextsin a diagrammatic representation, amenable to automatic code generation.One of the main contributions of our work is to recognize that primitives for invoking Web services and primi-tives for composing them into complex processes are orthogonal. In our proposal, the former primitives reflectthe Web Service Description Language [6] standard, while the latter primitives correspond to the WorkflowManagement Coalition [5] model. These extensions give WebML the ability to describe arbitrarily complexprocesses, possibly interacting with remote services, granting a significant increase of expressive power; theincorporation of new primitives is seamless, thanks to the extensibility of WebML.1" @default.
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• W91094420 date "2002-01-01" @default.
• W91094420 modified "2023-09-23" @default.
• W91094420 title "Model-driven Specification of Web Services Composition and Integration with Data-intensive Web Applications" @default.
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