In this chapter, we studied Extensible Markup Language and several of its related technologies. We began by discussing some basic XML terminology, introducing the concepts of markup, XML vocabularies and XML parsers (validating and nonvalidating). We then demonstrated how to describe and structure data in XML, illustrating these points with examples marking up an article and a business letter.

The chapter discussed the concept of an XML namespace. You learned that each namespace has a unique name that provides a means for document authors to unambiguously refer to elements with the same name (i.e., prevent naming collisions). We presented examples of defining two namespaces in the same document, as well as setting the default namespace for a document.

We also discussed how to create DTDs and schemas for specifying and validating the structure of an XML document. We showed how to use various tools to confirm whether XML documents are valid (i.e., conform to a DTD or schema).

The chapter also demonstrated how to create and use XSL documents to specify rules for converting XML documents between formats. Specifically, you learned how to format and sort XML data as XHTML for display in a Web browser.

The final sections of the chapter presented more advanced uses of XML in C# applications. We demonstrated how to retrieve and display data from an XML document using various classes of the .NET Framework. We illustrated how a Document Object Model (DOM) tree represents each element of an XML document as a node in the tree. The chapter also demonstrated reading data from an XML document using the XmlReader class, displaying DOM trees graphically and locating data in XML documents with XPath. Finally, we showed how to use .NET Framework classes XmlReader and XslCompiledTransform to perform schema validation and XSL transformations, respectively.

In Chapter 20, we begin our discussion of databases, which organize data in such a way that the data can be selected and updated quickly. We introduce Structured Query Language (SQL) for writing simple database queries (i.e., searches) and ADO.NET for manipulating information in a database through C#. You will learn how to create XML documents based on data in a database.



    Introduction to Computers, the Internet and Visual C#

    Introduction to the Visual C# 2005 Express Edition IDE

    Introduction to C# Applications

    Introduction to Classes and Objects

    Control Statements: Part 1

    Control Statements: Part 2

    Methods: A Deeper Look


    Classes and Objects: A Deeper Look

    Object-Oriented Programming: Inheritance

    Polymorphism, Interfaces & Operator Overloading

    Exception Handling

    Graphical User Interface Concepts: Part 1

    Graphical User Interface Concepts: Part 2


    Strings, Characters and Regular Expressions

    Graphics and Multimedia

    Files and Streams

    Extensible Markup Language (XML)

    Database, SQL and ADO.NET

    ASP.NET 2.0, Web Forms and Web Controls

    Web Services

    Networking: Streams-Based Sockets and Datagrams

    Searching and Sorting

    Data Structures



    Appendix A. Operator Precedence Chart

    Appendix B. Number Systems

    Appendix C. Using the Visual Studio 2005 Debugger

    Appendix D. ASCII Character Set

    Appendix E. Unicode®

    Appendix F. Introduction to XHTML: Part 1

    Appendix G. Introduction to XHTML: Part 2

    Appendix H. HTML/XHTML Special Characters

    Appendix I. HTML/XHTML Colors

    Appendix J. ATM Case Study Code

    Appendix K. UML 2: Additional Diagram Types

    Appendix L. Simple Types


    Visual C# How to Program
    Visual C# 2005 How to Program (2nd Edition)
    ISBN: 0131525239
    EAN: 2147483647
    Year: 2004
    Pages: 600

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