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By Martyn Prigmore

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What are the three aims of a data model? 7 What is a document model? What are the aims of a document model? 8 Explain the purpose of the following technologies: (a) web browser (b) web server (c) database management system (d) database client. 9 Explain what is meant by saying that the Web is a distributed collection of hypermedia documents. 10 Explain the difference between static and dynamic web content. 11 What problems of file-based applications does the database approach overcome? 12 Explain why the database instance will change more frequently than the database schema.

Castro, 2007, p. 17). Investigate these criticisms. How do you think these problems affect web database developers? com/blog/753/no-i-am-not-bloody-sorry. Warning, free speech zone! QXD 10/5/07 2 11:06 AM Page 29 Network, database and web technology Chapter objectives ➔ To introduce the notion of client-server computing and examine typical application architectures. ➔ To discuss the network technologies that facilitate client-server computing. ➔ To discuss database technologies and the ANSI/SPARC database systems architecture.

This power is achieved as a result of complexity, so SGML can be difficult to use. 5 The Web and web technology software tools that allow users to easily create SGML document models and documents based on those document models. Consequently, these tools are expensive. In particular, it would be extremely difficult to write a web browser that could understand documents with any SGML document model. That is why HTML was created. As all HTML documents have the same document model, it is much easier for content producers to produce HTML documents and for application developers to write a web browser that can understand them.

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