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DocBook is an XML application, just as XHTML is. It has elements and attributes, as you would expect, and it follows a specific Document Type Definition (DTD); that is, it has defined rules that translate the data at parsing time. DocBook uses Extensible Stylesheet Language (XSL) and stylesheets to transform the DocBook XML into a presentation format.

The ADO.NET DataSet can represent any data as an XML document, without requiring an error-prone conversion step. This has a number of interesting consequences. For example, it allows you to easily save the information you ve retrieved from the database in an XML file so you can retrieve it for later use. This feature is particularly useful for client applications that aren t always connected to the network, but you may choose to use it occasionally in a web application.

The accessibility keywords don t just apply to variables. They also apply to methods, properties, and events, all of which will be explored in this chapter.

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Just when you think you ve identified everywhere XML markup is used, you ll find it appearing somewhere new. You ll find XML when you write an advertisement file that defines the content for the AdRotator control, when you create an ASP.NET site map, or when you use .NET serialization to write an object to a file. That these formats use XML probably won t change the way they work, but it does open up other possibilities for integrating the data with other applications and tools. It s also one more example that the developers of the .NET Framework have embraced XML in unprecedented ways, abandoning Microsoft s traditional philosophy of closed standards and proprietary technologies.

Tip By convention, all the public pieces of your class (the class name, public events, properties and procedures,

The basic premise of XML is fairly simple, although the possible implementations of it (and the numerous extensions to it) can get quite complex. XML is designed as an all-purpose format for organizing data. In many cases, when you decide to use XML, you re deciding to store data in a standardized way, rather than creating your own new (and to other developers, unfamiliar) format conventions. The actual location of this data in memory, in a file, in a network stream is irrelevant. The best way to understand the role XML plays is to consider the evolution of a simple file format without XML. For example, consider a simple program that stores product items as a list in a file. Say when you first create this program, you decide it will store three pieces of product information (ID, name, and price), and you ll use a simple text file format for easy debugging and testing. The file format you use looks like this: 1 Chair 49.33 2 Car 43399.55 3 Fresh Fruit Basket 49.99 This is the sort of format you might create by using .NET classes such as the StreamWriter. It s easy to work with you just write all the information, in order, from top to bottom. Of course, it s a fairly fragile format. If you decide to store an extra piece of information in the file (such as a flag that indicates whether an item is available), your old code won t work. Instead, you might need to resort to adding a header that indicates the version of the file:

and so on) should use Pascal case. This means the name starts with an initial capital. (The function name

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