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With all the businesses that are accessing the Web and using software to connect to each other and exchange data, a standard way of describing the data and its structure is necessary to allow these systems to understand the data. That standard is XML (eXtensible Markup Language). As with HTML, the current XML standard is based on an ISO standard, but the most commonly used version is the one maintained and published by W3C. Where HTML deals with presentation, XML deals with data. Because a file in XML format contains not only the data but also a description of the structure of the data, receiving systems know exactly how to process the data from the information included in the file.

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To build an application that uses this XML file, we need a way to open the XML file and read its contents. We also might need a way to create a file with the same structure as the file shown, as well as a way to modify specific links contained within the XML file. If you ve done any work with XML, you already know that these scenarios are exactly what an XML API is designed for. Rather than resorting to brute force string manipulation, we use an API that is designed to make loading, manipulating, and saving XML easy for programmers. Over the years we ve seen many different implementations of APIs for working with XML. While they all share some common attributes, they each have a different style and approach that make them unique. Today, when working with XML in .NET, we can choose from a variety of APIs. Our choice largely depends upon what we re trying to accomplish. If we re interested in the low-level parsing of XML, we can use the XmlTextReader class. If we re dealing with large documents, we might choose a streaming API such as XmlReader. And if we re interested in an API that will make it easy to traverse the XML, we might choose to use the DOM available via the XmlNode class, or the XPathNavigator class, which allows traversal of XML nodes via XPath expressions. Each API provides unique advantages and has specific strengths and weaknesses. But what they all have in common is their goal of allowing developers to build applications that use XML.

For details about creating a simple HTML page from Microsoft Access, see 26, Creating Static and Dynamic Web Pages.

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With so many .NET XML API choices available today, you might be wondering why we need LINQ to XML at all. After all, it appears we have a lot of specialized XML APIs that are designed for working with XML data. Let s now take a look at why we need yet another XML programming API.

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Microsoft Office Access 2003 Inside Out For example, an insurance company might receive data from an outside company that manages some of its insurance claims. The insurance company needs to know which fields the file includes, the data type of the fields, and the order in which the fields occur in the data file. If the file is coded in XML, the company can easily import this file into Access or any other program that understands XML, even if the sending company changes the format or content of the file. With other file types, such as fixed-width text files, you must know the file format so that you can define the import/export specification for Access before you attempt to import the file. One of the major new features in Microsoft Office Access 2003 is an enhanced ability to work with data published using the latest XML standards. Access 2003 can now easily import and export XML files and related style sheets. (A very limited ability to work with certain XML files was implemented in Microsoft Access 2002.) You can see an example of a file imported as XML and displayed in a datasheet subform in Figure 25-4.

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