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In this modern Web 2.0 world, Web applications are often expected to make use of advanced techniques, such as , to communicate with the server in various, interesting ways. Django supports this, but there are no standard mechanisms provided. Instead, each application must decide how best to handle these special types of interactions. These Web 2.0 applications often need to render the same content for standard browser requests as for these special types of requests, just in different formats, in order to make sure the application works without JavaScript enabled. It also helps to maintain individual URLs that can be bookmarked and retrieved as a whole, while still allowing just the essential content to be pulled up when necessary. Since views normally return their responses directly, complete with full contents, this type of functionality only seems possible in one of two ways, each requiring a good deal of code duplication: third function that each view can call.

The following are ways to read and navigate the content of an XML file: Using XmlDocument: You can load the document using the XmlDocument class mentioned earlier. This holds all the XML data in memory once you call Load() to retrieve it from a file or stream. It also allows you to modify that data and save it back to the file later. The XmlDocument class implements the full XML DOM. Using XPathNavigator: You can load the document into an XPathNavigator (which is located in the System.Xml.XPath namespace). Like the XmlDocument, the XPathNavigator holds the entire XML document in memory. However, it offers a slightly faster, more streamlined model than the XML DOM, along with enhanced searching features. Unlike the XmlDocument, it doesn t provide the ability to make changes and save them. Using XmlTextReader: You can read the document one node at a time using the XmlTextReader class. This is the least expensive approach in terms of server resources, but it forces you to examine the data sequentially from start to finish. The following sections demonstrate each of these approaches to loading the DVD list XML document.

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Figure 12-2 shows the final web page that reads the DVDList.xml document and displays a list of elements, using different levels of indenting to show the overall structure. The XmlDocument stores information as a tree of nodes. A node is the basic ingredient of an XML file and can be an element, an attribute, a comment, or a value in an element. A separate XmlNode object represents each node, and nodes are grouped together in collections. You can retrieve the first level of nodes through the XmlDocument.ChildNodes property. In this example, that property provides access to the <DvdList> element. The <DvdList> element contains other child nodes, and these nodes contain still more nodes and the actual values. To drill down through all the layers of the tree, you need to use recursive logic, as shown in this example.

The condition for a while loop is a list of one or more commands, and the commands to be executed while the condition remains true are placed between the keywords do and done: while <list> do <list> done By incrementing a variable each time the loop is executed, the commands can be run a specific number of times: n=1 while [ $n -le 10 ] do echo "$n" n=$(( $n + 1 )) done The true command can be used to create an infinite loop: while true ## : can be used in place of true do read x done

Figure 12-2. Retrieving information from an XML document When the example page loads, it creates an XmlDocument object and calls the Load() method, which retrieves the XML data from the file. It then calls a recursive function in the page class named GetChildNodesDescr(). GetChildNodesDescr() takes an XmlNodeList object as an input and the index of the nesting level. It then returns the string with the content for that node and all its child nodes and attributes. private void Page_Load(object sender, System.EventArgs e) { string xmlFile = Server.MapPath("DvdList.xml"); // Load the XML file in an XmlDocument. XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Write the description text. XmlText.Text = GetChildNodesDescr(doc.ChildNodes, 0); }

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