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The .NET Framework Base Class Library provides a rich set of classes that allows you to work with XML data. The relationship between the .NET Framework and XML doesn t end here. There are a host of other features that make use of XML. These features include the following: .NET configuration files ADO.NET ASP.NET server controls XML serialization Remoting Web services XML documentation SQL Server XML features XML parsing XML transformation In this section, you will take a brief look at each of these features.
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The core XML-related classes from the Base Class Library are physically found in an assembly called System.Xml.dll. This assembly contains several namespaces that encapsulate various XML-related classes. The LINQ to XML classes are physically available in the System.Xml. Linq.dll assembly. In the following sections, you will take a brief look at some of the important namespaces from these assemblies.
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CHAPTER 1 INTRODUCING XML AND THE .NE T FRAM EWORK
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The System.Xml namespace is one of the most important namespaces. It provides classes for reading and writing XML documents. Classes such as XmlDocument represent the .NET Framework s DOM-based parser, whereas classes such as XmlTextReader and XmlTextWriter allow you to quickly read and write XML documents. This namespace also contains classes that represent various parts of an XML document; these classes include XmlNode, XmlElement, XmlAttribute, and XmlText. We will be using many of these classes throughout this book.
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The System.Xml.Schema namespace contains various classes that allow you to work with schemas. The entire Schema Object Model (SOM) of .NET is defined by the classes from this namespace. These classes include XmlSchema, XmlSchemaElement, XmlSchemaComplexType, and many others.
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System.Xml.XPath Namespace
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The System.Xml.XPath namespace provides classes and enumerations for finding and selecting a subset of the XML document. These classes provide a cursor-oriented model for navigating through and editing the selection. The classes include XPathDocument, XPathExpression, XPathNavigator, XPathNodeIterator, and more.
System.Xml.Xsl Namespace
The System.Xml.Xsl namespace provides support for XSLT transformations. By using the classes from this namespace, you can transform XML data from one form to another. The classes provided by this namespace include XslCompiledTransform, XslTransform, XsltSettings, and so on.
System.Xml.Serialization Namespace
The System.Xml.Serialization namespace provides classes and attributes that are used to serialize and deserialize objects to and from XML format. These classes are extensively used in web services infrastructures. The main class provided by this namespace is XmlSerializer. Some commonly used attributes classes such as XmlAttributeAttribute, XmlRootAttribute, XmlTextAttribute, and many others are also provided by this namespace.
System.Xml.Linq Namespace
The System.Xml.Linq namespace contains classes related to the LINQ to XML features. Using these classes you can manipulate XML documents and fragments efficiently and easily. Some of the important tasks that you can accomplish include loading XML from files or streams, creating XML trees via code, querying XML trees using LINQ operators, modifying XML trees, validating XML trees against schema, and transforming XML trees. Some of the frequently used classes from the System.Xml.Linq namespace are XDocument, XElement, XNode, XAttribute, and XText.
CH APT ER 1 IN TRO D UCI NG X ML A ND T HE .NET F RAME WO RK
The Classic XML Parsing Model of the .NET Framework
The previous sections discussed two types of parsers: DOM- or tree-based parsers and SAX- or event-based parsers. It would be reasonable for you to expect that the .NET Framework supports parsing models for both types of parsers. Though you won t be disappointed at its offerings, there are some differences that you must know. In the .NET Framework, you can categorize the XML parsers into two flavors: Parser based on the DOM Parsers based on the reader model The first thing that may strike you is the lack of a SAX-based parser. But don t worry, the new reader-based parsers provide similar functionality in a more efficient way. You can think of reader-based parsers as an alternative to traditional SAX-based parsers. The DOM-based parser of the .NET Framework is represented chiefly by a class called XmlDocument. By using this parser, you can load, read, and modify XML documents just as you would with any other DOM-based parser (such as MSXML, for example). The reader-based parsers use a cursor-oriented approach to scan the XML document. The main classes that are at the heart of these parsers are XmlReader and XmlWriter. These two classes are abstract classes, and other classes (such as XmlTextReader and XmlTextWriter) inherit from them. You can also create your own readers and writers if you so wish. Thus to summarize, the .NET Framework supports DOM parsing and provides an alternate and more efficient way to carry out SAX-based parsing. I will be discussing these parsers thoroughly in subsequent chapters.
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