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Let s first focus on the presentation of the prototype. As you can see in Figure 3-3, the deck has three labels Java, Open Source, and .NET. Each label represents an expandable region, and in Figure 3-3 the Java region is currently expanded and shows its content. These labels are containers, since they can hold more than just text (for example, a combination of

Down Recursively with XContainer.Descendants()

There is nothing new here. I just created the same document I usually do for the examples and displayed it. Now I will validate the document: bool valid = true; xDocument.Validate(schemaSet, (o, vea) => { Console.WriteLine("An exception occurred processing object type {0}.", o.GetType().Name); Console.WriteLine(vea.Message); valid = false; }, true); Console.WriteLine("Document validated {0}.{1}", valid "successfully" : "unsuccessfully", System.Environment.NewLine); Notice that I validate a little differently than I have in previous examples. I initialize a bool to true, representing whether the document is valid. Inside the validation handler, I set it to false. So if a validation error occurs, valid will be set to false. I then check the value of valid after validation to determine whether the document is valid, and display its validity. In this example, the document is valid at this point. Now, it s time to imagine that I am allowing a user to edit any particular book participant. The user has edited the book participant whose first name is "Joe". So I obtain a reference for that element, update it, and revalidate it after the update: XElement bookParticipant = xDocument.Descendants("BookParticipant"). Where(e => ((string)e.Element("FirstName")).Equals("Joe")).First(); bookParticipant.Element("FirstName"). AddAfterSelf(new XElement("MiddleInitial", "C")); valid = true; bookParticipant.Validate(bookParticipant.GetSchemaInfo().SchemaElement, schemaSet, (o, vea) => { Console.WriteLine("An exception occurred processing object type {0}.", o.GetType().Name); Console.WriteLine(vea.Message); valid = false; }, true); Console.WriteLine("Element validated {0}.{1}", valid "successfully" : "unsuccessfully", System.Environment.NewLine); As you can see, I initialize valid to true and call the Validate method, this time on the bookParticipant element instead of the entire document. Inside the validation event handler, I set valid to false. After validation of the book participant element, I display its validity. Here are the results:

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In addition to recursively traversing up, you can recursively traverse down with the Descendants method. Again, this method only returns elements. There is an equivalent method named DescendantNodes that will return all descendant nodes. Listing 7-56 is the same code as the previous, except we call the Descendants method on the first book participant element.

XElement firstParticipant; // A full document with all the bells and whistles. XDocument xDocument = new XDocument( new XDeclaration("1.0", "UTF-8", "yes"), new XDocumentType("BookParticipants", null, "BookParticipants.dtd", null), new XProcessingInstruction("BookCataloger", "out-of-print"), // Notice on the next line that we are saving off a reference to the first // BookParticipant element. new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XComment("This is a new author."), new XProcessingInstruction("AuthorHandler", "new"), new XAttribute("type", "Author"), new XElement("FirstName", new XText("Joe"), new XElement("NickName", "Joey")), new XElement("LastName", "Rattz")), new XElement("BookParticipant",

Here is the source XML document: <BookParticipants> <BookParticipant type="Author"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> <BookParticipant type="Editor"> <FirstName>Ewan</FirstName> <LastName>Buckingham</LastName> </BookParticipant> </BookParticipants>

images and text). Within the expanded Java region is a mix of plain text and links. Styles control the actual look and feel. Code Sample 3-1 shows the HTML needed to create the deck component. Code Sample 3-1. The Deck HTML Prototype Implementation <html> <head> <title>Pro JSF : ProShowOneDeck Prototype</title> <style type="text/css" > .ProShowOne { ... } .ProShowItem { ... } .ProShowItemHeader { ... } .ProShowItemContent { ... } </style> </head> <body> <div style="width:200px;" > <div class="ProShowOne"> <div class="ProShowItem"> <div class="ProShowItemHeader" onclick="alert('first')" > <img src="resources/java_small.jpg" alt="The Duke" style="margin-right: 8px; vertical-align:bottom;" /> Java </div> <div class="ProShowItemContent"> <table> <tbody> <tr> <td> <a href="http://www.apress.com/..."> Pro JSF: Building Rich Internet Components </a> </td> </tr> <tr> <td>Pro EJB 3</td> </tr> <tr> <td>Pro Apache Maven</td> </tr> </tbody> </table> </div>

new XAttribute("type", "Editor"), new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); foreach (XElement element in firstParticipant.Descendants()) { Console.WriteLine(element.Name); } The results are the following: FirstName NickName LastName As you can see, it traverses all the way to the end of every branch in the XML tree.

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