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Transforming XML with XSLT
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n the previous chapters, we dealt with XML documents and their manipulation. Our interaction with XML documents was limited to reading, writing, querying, and validating them with the help of .NET Framework classes. No doubt these operations are widely needed in real-world XML applications. However, often you also need to transform XML data from one representation to another. For example, you may need to convert XML data into HTML so that it can be displayed in the browser. So, how do we accomplish such a transformation This is where Extensible Stylesheet Language Transformations (XSLT) comes into the picture. This chapter covers details of XSLT processing via .NET Framework classes. Specifically, you will learn the following: What XSLT is The XslCompiledTransform class that is the .NET Framework s XSLT processor How to transform XML documents by using XslCompiledTransform How to use XSLT extension objects How to pass parameters to XSLT style sheets How to emit script in XSLT style sheets
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Overview of XSLT
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XML markup often needs to be transformed before it can be put to any use. To cater to this requirement, the W3C introduced Extensible Stylesheet Language (XSL) a standard for representing style sheets for XML documents. XSL was intended to act along the same lines as Cascading Style Sheets (CSS), which are used to style HTML pages. However, over a period of time, the W3C realized the complexity involved in transforming XML documents, and the overall XSL standards were separated into XSLT, XPath, and XSL-FO. Out of these three main subdivisions, XSLT is intended for transforming XML documents.
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Note The XPath standard allows you to query and navigate XML documents; 4 covered XPath.
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XSL Formatting Objects (XSL-FO) is intended to format XML documents and is beyond the scope of this book.
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XSLT consists of elements and functions that together allow you to transform XML documents. To understand how XSLT elements and functions are used, you will use a simple example. Suppose that you have an XML document as shown in Listing 6-1. As you can see, it is the same Employees.xml file that we have been using for all of our examples. Listing 6-1. Sample XML Document (Employees.xml) < xml version="1.0" encoding="utf-8" > <!-- This is list of employees --> <employees> <employee employeeid="1"> <firstname>Nancy</firstname> <lastname>Davolio</lastname> <homephone>(206) 555-9857</homephone> <notes> <![CDATA[includes a BA in psychology from Colorado State University in 1970. She also completed "The Art of the Cold Call." Nancy is a member of Toastmasters International.]]> </notes> </employee> <employee employeeid="2"> <firstname>Andrew</firstname> <lastname>Fuller</lastname> <homephone>(206) 555-9482</homephone> <notes> <![CDATA[Andrew received his BTS commercial in 1974 and a Ph.D. in international marketing from the University of Dallas in 1981. He is fluent in French and Italian and reads German. He joined the company as a sales representative, was promoted to sales manager in January 1992 and to vice president of sales in March 1993. Andrew is a member of the Sales Management Roundtable, the Seattle Chamber of Commerce, and the Pacific Rim Importers Association.]]> </notes> </employee> <employee employeeid="3"> <firstname>Janet</firstname> <lastname>Leverling</lastname> <homephone>(206) 555-3412</homephone> <notes> <![CDATA[Janet has a BS degree in chemistry from Boston College (1984). She has also completed a certificate program in food retailing management. Janet was hired as a sales associate in 1991 and promoted to sales representative in February 1992.]]> </notes> </employee> </employees> Now further assume that you wish to display this XML file in a web browser, as shown in Figure 6-1.
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C HA PTER 6 TRAN SFORM IN G XML WITH XSLT
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Figure 6-1. XML document converted to an HTML table This means you wish to convert XML markup into HTML markup (XHTML, to be more specific). This transformation is achieved by XSLT. Let s see how. Listing 6-2 shows Employees.xslt an XSLT style sheet that will be applied to Employees.xml. Listing 6-2. XSLT for Transforming Employees.xml into an HTML Table < xml version="1.0" encoding="UTF-8" > <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/"> <html> <body> <h1>Employee Listing</h1> <table border="1"> <tr> <th>Employee ID</th> <th>First Name</th> <th>Last Name</th> <th>Home Phone</th> <th>Notes</th> </tr> <xsl:for-each select="employees/employee"> <tr> <td> <xsl:value-of select="@employeeid"/> </td>
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