Advanced Information Systems Engineering: 12th International by Dennis Tsichritzis (auth.), Benkt Wangler, Lars Bergman

By Dennis Tsichritzis (auth.), Benkt Wangler, Lars Bergman (eds.)

CAiSE 2000 used to be the twelfth within the sequence of foreign meetings on complex details structures Engineering. within the 12 months 2000 the convention again to Stockholm the place it used to be equipped the first actual time. when you consider that that yr, 1989, the CAiSE meetings have built into a huge discussion board for the presentation and trade of analysis effects and sensible studies in the box of knowledge structures Engineering. the target of the CAiSE convention sequence is to collect researchers and practitioners within the box of knowledge platforms engineering to fulfill every year with a purpose to talk about evolving examine matters and functions during this box. The CAiSE convention sequence additionally goals to supply a chance for younger scientists to set up relationships with senior scientists of their components of curiosity. Stockholm is a crucial middle of analysis and improvement for a number of the best IT and communications businesses in Europe and certainly, on the earth. In track with this atmosphere, a big subject of CAiSE 2000 used to be "information structures and providers in a digitized world". This topic displays the sizeable advancements in conversation expertise, together with the expanding use of web and WWW, that has taken position during the last years, and that has ended in larger verbal exchange and more straightforward info entry mostly. moreover, this improvement has initiated adjustments within the method businesses cooperate and trade.

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Two issues are critical in building such software agents: extensibility and flexibility. The internet is an open and fast changing environment. Information B. Wangler, L. ): CAiSE 2000, LNCS 1789, pp. 32-46, 2000. © Springer-Verlag Berlin Heidelberg 2000 Towards Extensible Information Brokers Based on XML 33 sources, internet connections, and the information agents themselves may appear and disappear unpredictably, or simply change with no warning. Any software agent that operates within such an environment needs to be easily adaptable to the volatile internet environment.

Information Source I DOM Object " XML generator | Output \ Output Template WehL Interpreter >.. tf WebL-based Script Output Binding Def Query Web description Transformer parser Input Binding Def • I Input/Output Spec XML wrapper for Web Site Web Ascription Fig. 7. XML Wrapper generation The description parser parses the web description. From the input binding, the URL constructor is able to generate the URL to get the corresponding webpage in HTML format. keyword-query="XML". At the same time, given the output template, the output bindings, and the input/output descriptions, the Transformer will generate the WebL [17] scripts that can extract the relevant data.

Towards Extensible Information Brokers Based on XML 35 We shall call these four components of a service description as INPUT BINDING INPUT, OUTPUT, and OUTPUT BINDING, respectively. Figure 1 is an example of an Amazon search service description. 1 Input and Output Descriptions Information sources usually allow only a limited number of query forms to be submitted. The input description defines the set of queries acceptable to a particular service. It consists of a set of variables that a user can associate values with, and their corresponding range specification.

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