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- W323061484 abstract "In this article, the main characteristics of the educational browser YADBrowser are described. One of the main objectives of this project is to define new languages and object models which facilitate the creation of educational applications for the Internet. The fundamental characteristics of the object model of the browser are also described. YADBrowser markup language is inspired by HTML 4. In this article, the main differences between them are mentioned. The fundamentals of the OPScript language are also exposed. It was created to be used as the script language for the browser. The relations between this project and other efforts aiming to define new languages and browsers for domain specific applications are defined. Introduction The Internet is currently one of the most effective means to publish information of any kind. The Web is also a natural field for educational hypermedia applications (Montessoro, Pierattoni, & Cicuttini, 2003). The Internet functions due to languages and protocols that have prevailed for their simplicity and generality which allows them to be used in different applications. One of the main problems of the Internet is the lack of semantic information; there are many efforts on this subject (Van Ossenbruggen, Hardman, & Rutledge, 2002). It is also hard to construct context-based adaptive systems mainly because links between documents are static and sometimes it is desirable to offer different ways to students according to their knowledge and skills. Also, educational applications could be developed more efficiently and in less time if a wider collection of objects adapted to these applications was available in current browsers. There are reports of the development of object models for web applications to save effort and time (Hennen, Ramachandran, & Mamrak, 2000). With investigational objectives, the authors are developing a project to define new object models and languages all oriented to the creation of educational applications. Up to this moment, an object model and a script language have been developed; they are being used in a browser which has taken some characteristics from current web browsers. The browser also uses a markup language that is a subset of HTML 4. Some additions have been made to this subset to better adapt it to educational applications' requirements. Some authors have created new markup languages for domain specific applications--some of them are XML based languages (Wang, Kajler, Zhou, & Zou, 2003). The language named Mathematics Education Markup Language (MeML), was created for publishing mathematical content on the Internet. There are features covered in this article which allow the programmer to define extensions to the browser object model that persist from document to document. Some authors have stated the advantages of saving some data in the main memory of the browser (Uehara, Mizuno, & Kikuno, 2001). Persistent extensions can be very useful when an application is organized hierarchically. That is why the YADBrowser was created for educational applications where a user must follow a previously defined path, no matter if the path is generated dynamically. In these applications, common elements can be identified and reused. The YADBrowser allows authors to take advantage of this characteristic of educational applications. For example, if the application is an online course and to access topic one the user should visit the introduction page first, the author of the course could define a function that can be used in the introduction document and in every topic. If the definition can persist in time, bandwidth and time can be saved. There is a great interest in saving bandwidth and many techniques including sharing information between browsers have been reported (Xiao, Zhang, & Xu, 2002; Xiao, Zhang, Andrzejak, & Chen, 2004). In particular, persistent additions could be used to develop applications for people with slow Internet connections and/or applications for children where slower responses to events can distract the student. …" @default.
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- W323061484 date "2005-06-22" @default.
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- W323061484 title "YADBrowser: A Browser for Web-Based Educational Applications" @default.
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