Wrox Press Professional ASP.NET 1.0 XML with C# (2002).pdf

What You Need to Use This Book

You need to have the following software installed:

* Windows 2000/XP Professional or higher, with IIS installed

* Any version of Visual Studio .NET

* SQL Server 2000, or MSDE (provided with VS.NET)

In addition, the book assumes:

* An intermediate knowledge of the C# language

* A basic understanding of SQL Server and its query syntax

* Some familiarity with XML

Summary of Contents

Introduction

Chapter 1:

Chapter 2:

Chapter 3:

Chapter 4:

Chapter 5:

Chapter 6:

Chapter 7:

Chapter 8:

Chapter 9:

Chapter 10:

Chapter 11:

Index

Introduction to XML Technologies

XmlReader and XmlWriter

XmlDocument

XPath

Transformations

ADO. NET

SQL Server 2000 and SqIXml Managed Classes

E-Business and XML

XQuery

Performance

A Web Services Case Study - An E-Commerce Business Engine

177

215

245

267

301

325

367

413

Professional ASP.NET XML with C#

Chris Knowles

Stephen Mohr

J Michael Palermo IV

Pieter Siegers

Darshan Singh

Wrox Press Ltd.

Introduction to XML Technologies

In this chapter, we'll look at current and upcoming Extensible Markup Language (XML). We'll begin by

describing what XML is and then talk about where it can help us, some related standards, and focus on

some important design considerations when writing an XML application.

More specifically, this chapter follows this route map:

An Introduction to XML

❑

The Appeal of XML

❑

XML in Vertical Industries

❑

Web Architecture Overview

❑

ASP.NET Web Development

❑

XML 1.0 Syntax

❑

Processing XML

❑

XML Data Binding and XML Serialization

❑

Validating XML

❑

Navigating, Transforming, and Formatting XML

❑

Other Standards in the XML Family

❑

XML Security Standards

❑

XML Messaging

❑

Chapter 1

By the end of this chapter, you'll have a good understanding of the key XML standards, what they do,

where they fit, and how they relate to each other.

An Introduction to XML

The success of XML can be gauged by the fact that since its release in February 1998, there are now

more than 450 other standards based on XML or directly relating to XML in some way. A day seldom

goes by without our encountering XML somewhere, either in a press release, or white paper, or

online/print article. Almost all new (mostly Web) application development jobs post XML experience

as a preferred skill to have. Microsoft's .NET Framework represents a paradigm shift to a platform that

uses and supports XML extensively. Every database and application vendor is adding some kind of

support for XML to their products. The success of XML cannot be overemphasized. No matter which

platform, which language you are working with, knowledge of this technology will serve you well.

What is XML?

In its simplest form, the XML specification is a set of guidelines, defined by the World Wide Web

Consortium (W3C), for describing structured data in plain text. Like HTML, XML is a markup

language based on tags within angled brackets, and is also a subset of SGML (Standard Generalized

Markup Language). As with HTML, the textual nature of XML makes the data highly portable and

broadly deployable. In addition, XML documents can be created and edited in any standard text editor.

But unlike HTML, XML does not have a fixed set of tags; rather it is a meta-language that allows

creation of other markup languages. It is this ability to define new tags that makes XML a truly

extensible language. Another difference from HTML, which focuses on presentation, is XML's focus on

data and its structure. For these reasons, XML is much stricter in its rules of syntax, or "well-

formedness", which require all tags to have a corresponding closing tag, not to overlap, and more. For

instance, in XML you may define a tag, or more strictly the start of an element , like this, <invoice> ,

and it could contain the attribute customer="1234" like so: <invoice customer="1234"> . This

element would have to be completed by a corresponding closing tag </invoice> for the XML to be

well-formed and useable.

The W3C

The W3C is an independent standards body consisting of about 500 members, formed in 1994 under

the direction of Tim Berners-Lee. Its primary purpose is to publish standards for technologies directly

related to the Web, such as HTML and XML.

However, the syntax and usage that the W3C devises do not have governmental backing, and are thus not

officially 'standards' as such, hence the W3C's terminology of 'Recommendation'. However, these

Recommendations are de facto standards in many industries, due to the impartial nature of the W3C itself.

Once a standard has achieved Recommendation status, it will not be modified or added to any further.

Before reaching that status, standards are first classed as Working Draft, which is still subject to change,

and finally a Last Call Working Draft, where no significant changes are envisaged.

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