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transformations is just more dynamic. Unlike using the LINQ to XML functional construction approach, you do not have to recompile code to change the transformation. Merely changing the XSLT document allows you to modify the transformation at runtime. Lastly, XSLT is a known technology with many developers having expertise that may be able to assist you. At least in the early days of LINQ, this may not be available if you take the functional construction approach. Using the functional construction approach does not really buy you much. It does allow you to perform XML transformations knowing nothing more than LINQ to XML. So if you do not already know XSLT, and your transformation needs are modest, this may be a fine approach for you. Also, while functional construction is less convenient than merely modifying an XSLT document, having to recompile code to modify a transformation could be said to add security. Someone cannot simply muck with an outside document to modify the transformation. So for those times when you think you are pushing the limits by using Sarbanes-Oxley as the excuse for not doing something, blame it on the fact that you cannot simply change the transformation without a code overhaul. Or if you are in the medical field and you don t think you can get away with blaming HIPAA one more time, transformation via functional construction may just be the obstacle you need on which to blame a lack of agility.

Creating an element with a text value is a pretty simple task. Listing 7-33 is some code doing just that.

JSF 1.2 supports the direct use of JSP 2.1 ValueExpression and MethodExpression, rather than passing a String to the tag handler and requiring it to parse the expression internally. As a result, the UIComponentTagSupport setStringProperty() method described in this chapter would change as follows for JSF 1.2: protected void setStringProperty( UIComponent component, String attrName, ValueExpression value) { if (value == null) return; if (!value.isLiteralText()) { component.setValueExpression(attrName, value); } else { component.getAttributes().put(attrName, value.getExpressionString()); } } If the ValueExpression is actually just literal text, then this text is pushed directly into the component attribute s map. Otherwise, the ValueExpression is set on the component for this attribute for deferred evaluation during the execution of the JSF lifecycle.

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XElement xFirstName = new XElement("FirstName", "Joe"); Console.WriteLine(xFirstName); This is straightforward, and there are no surprises. Running the code by pressing Ctrl+F5 produces the following results: <FirstName>Joe</FirstName> What is hidden, though, is the fact that the string "Joe" is converted into an XText object, and it is that object that is added to the XElement object. In fact, examining the xFirstName object in the debugger reveals that it contains a single node, an XText object whose value is "Joe". Since this is all done automatically for you, in most circumstances you will not need to directly construct a text object.

To perform an XML transformation using XSLT, you will utilize the XmlWriter and XmlReader bridge classes that you will obtain from the XDocument classes CreateWriter and CreateReader methods respectively. Because the example shown in Listing 9-5 requires a bit of explanation, I will explain it as I go. First, I will specify the transformation style sheet. Listing 9-5. Transforming an XML Document with XSLT string xsl = @"<xsl:stylesheet version='1.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform'> <xsl:template match='//BookParticipants'> <html> <body> <h1>Book Participants</h1> <table> <tr align='left'> <th>Role</th> <th>First Name</th> <th>Last Name</th> </tr> <xsl:apply-templates></xsl:apply-templates> </table> </body> </html> </xsl:template> <xsl:template match='BookParticipant'> <tr> <td><xsl:value-of select='@type'/></td> <td><xsl:value-of select='FirstName'/></td> <td><xsl:value-of select='LastName'/></td> </tr> </xsl:template> </xsl:stylesheet>";

However, should the need arise, you can create a text object by instantiating an XText object, as shown in Listing 7-34.

There is nothing earth-shattering here. I am just specifying some XSL to create some HTML to display my typical book participant XML as an HTML table. Next, I will create my XML document with the book participants: XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); This is just my typical XML. Now is where the magic happens. I need to create a new XDocument for the transformed version. Then, from that document, I will create an XmlWriter, instantiate an XslCompiledTransform object, load the transform object with the transformation style sheet, and transform my input XML document into the output XmlWriter: XDocument transformedDoc = new XDocument(); using (XmlWriter writer = transformedDoc.CreateWriter()) { XslCompiledTransform transform = new XslCompiledTransform(); transform.Load(XmlReader.Create(new StringReader(xsl))); transform.Transform(xDocument.CreateReader(), writer); } Console.WriteLine(transformedDoc); Of course, after all that, I display the transformed version of the document. As you can see, I use both bridge classes, XmlWriter and XmlReader, to perform the transformation. Here are the results: <html> <body> <h1>Book Participants</h1> <table> <tr align="left"> <th>Role</th> <th>First Name</th> <th>Last Name</th> </tr> <tr> <td>Author</td> <td>Joe</td> <td>Rattz</td> </tr> <tr> <td>Editor</td> <td>Ewan</td> <td>Buckingham</td> </tr> </table> </body> </html>

XText xName = new XText("Joe"); XElement xFirstName = new XElement("FirstName", xName); Console.WriteLine(xFirstName); This code produces the same output as the previous example, and if we examine the internal state of the xFirstName object, it too is identical to the one created in the previous example: <FirstName>Joe</FirstName>

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