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But if anything, XML is much more useful today than it ever was before. The benefits of using XML in a modern application include the following: Adoption: XML is ubiquitous. Many companies are using XML to store data or are actively considering it. Whenever data needs to be shared, XML is automatically the first (and often the only) choice that s examined. Extensibility and flexibility: XML imposes no rules about data semantics and does not tie companies into proprietary networks, unlike EDI (Electronic Data Interchange). As a result, XML can fit any type of data and is cheaper to implement. Related standards and tools: Another reason for XML s success is the tools (such as parsers) and the surrounding standards (such as XML Schema, XPath, and XSLT) that help in creating and processing XML documents. As a result, programmers in nearly any language have ready-made components for reading XML, verifying that XML is valid, verifying XML against a set of rules (known as a schema), searching XML, and transforming one format of XML into another. XML acts like the glue that allows different systems to work together. It helps standardize business processes and transactions between organizations. But XML is not just suited for data exchange between companies. Many programming tasks today are all about application integration web applications integrate multiple web services, e-commerce sites integrate legacy inventory and pricing systems, and intranet applications integrate existing business applications. All these applications are held together by the exchange of XML documents.

To get a more practical result with TreeView data binding, you need to use an XSL transform to create a more suitable structure, as described in the next section.

< xml version="1.0" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <compilation debug="true"> <assemblies> <add assembly="System.Data.OracleClient, Version=2.0.0.0, ..."/> </assemblies> </compilation> <!-- Other settings omitted. --> </system.web> </configuration> 5 explores the web.config file in greater detail. If you add a reference to an assembly that isn t stored in the GAC (global assembly cache), Visual Studio will create a Bin subdirectory in your web application and copy the DLL into that directory. This step isn t required for assemblies in the GAC because they are shared with all the .NET applications on the computer.

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XML is a fairly strict standard. This strictness is designed to preserve broad compatibility. HTML, on the other hand, is much more lenient. As a result, it s quite possible to create an HTML web page with errors that will be successfully rendered in one browser but interpreted differently in another. When it comes to storing business data, this type of error could cause catastrophic problems. To prevent this sort of problem, all XML parsers perform a few basic quality checks. If an XML document does not meet these standards, it s rejected outright. If the XML document does follow these rules, it s deemed to be well formed. Well-formed XML isn t necessarily correct XML for example, it could still contain incorrect data but an XML processor can parse it. To be considered well formed, an XML document must meet these criteria: Every start tag must have an end tag. An empty element must end with />. Elements can never overlap. In other words, <person><firstName></firstName>_</person> is valid, but <person><firstName></person></firstName> is not. An element cannot have two elements with the same name because there will be no way to distinguish them from each other. However, you can have elements with the same name in different places. For example, you can place a <name> element inside multiple <product> elements and a separate <customer> element. A document can have only one root element. All attributes must have quotes around the value. The document must not contain illegal characters. Comments and processing instructions can t be placed inside tags.

To learn how to format the TreeView, including how to tweak gridlines and node pictures, refer to 16.

Unlike previous versions of Visual Studio, in Visual Studio 2005 you won t see a list of assembly references in the Solution Explorer. Instead, you need to crack open the web.config file to get that information.

To quickly test if an XML document is well formed, try opening it in Internet Explorer. If there is an error, Internet Explorer will report a message and flag the offending line.

The XmlDataSource has similar built-in support for XSL transformations The difference is that you don t use the stylesheet to convert the XML to HTML Instead, you use it to convert the source XML document into an XML structure that s easier to data bind For example, you might generate an XML document with just the results you want and generate a flattened structure (with elements converted into attributes) for easier data binding To specify a stylesheet, you can set the XmlDataSourceTransformFile property to point to a file with the XSL transform, or you can supply the stylesheet as a single long string using the XmlDataSource Transform property You can use both stylesheets and XPath expressions, but the stylesheet is always applied first <asp:XmlDataSource ID="sourceDVD" runat="server" DataFile="DvdListxml" TransformFile="DVDTreeList.

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