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The DTD defines the root element of the XML document to be <employees>. This is done by using the <!ELEMENT> declaration, which specifies the name of the element (employees in our case) and content that can go inside it. In our case, the <employees> element can take zero or more <employee> elements and not any other element or text. This constraint is enforced by placing the acceptable element names (employee in our case) in the brackets. The asterisk (*) indicates that zero or more <employee> elements can be placed inside an <employees> element. Similar to *, you can also use the plus sign (+) and question mark ( ). The + operator indicates that you can have one or more occurrences of the element, whereas indicates that the element is optional. Next we define the <employee> element by using the same <!ELEMENT> declaration. Because the <employee> element must contain <firstname>, <lastname>, <homephone>, and <notes> subelements, they are specified as a comma-separated list. A comma-separated list of elements must appear in the order specified. If you want to allow the elements to appear in any order, you can use the pipe (|) character instead of the comma. The document then defines each of the subelements of the <employee> element. To indicate that the elements contain plain character data and no other subelements, we use #PCDATA, which stands for plain character data. Thus the DTD enforces that the <firstname>, <lastname>,

function DoPrev() { currentPic--; ShowPic(currentPic); } function DoNext() { currentPic++; ShowPic(currentPic); }

And it might render like this:

<homephone>, and <notes> elements can contain only plain character data and no markup or subelements. If our elements contained character data and subelements, we could have used ANY instead of #PCDATA. On the same lines, if our elements are empty (that is, they contain neither character data nor subelements), we could have used EMPTY. Finally, the DTD defines the employeeid attribute for the <employee> element by using the <!ATTLIST> declaration. The <!ATTLIST> declaration takes the element whose attributes are being defined, followed by a list of attributes. The CDATA in the markup indicates that the attribute value contains character data. You can mark the attribute as a unique identifier by specifying its type as ID. The #REQUIRED in the declaration indicates that this attribute is mandatory and must be provided in the document.

And that s it. You now have an Ajax page with forward (and backward) caching of images. You can streamline this page if you like when you think about it, Ajax isn t necessary for the ShowPage call you could simply construct an <img> tag from the current pic, but it is good to understand the technique, as you will use it in more complex apps. You can see the application in action in Figures 11-8 and 11-9. The latter is the result of clicking the >> button shown in Figure 11-8. As you run the application, you ll see how quickly the pictures update and render.

The <namespace> tag is completely dependent on the portal container used, and you should not rely on any specific formatting to parse out any data. Just use the <namespace> tag or the getNamespace() method on the portlet s RenderResponse object. Our JavaScript event handler would be rewritten to look like this:

<a href="/" onmouseover= "document.<portlet:namespace/>display.src='/images/display_off.jpg';">Home</a>

The entire code for the page is shown in Listing 11-4.

To create the DTD, you can use the Visual Studio IDE: add a new text file, but name it Employees.dtd. Type in the entire markup shown in Listing 5-1, and save the file. Open Employees.xml in the Visual Studio IDE, and add a DOCTYPE declaration to it at the top, as shown in Listing 5-2. Listing 5-2. Attaching the DTD to an XML Document < xml version="1.0" encoding="utf-8" > <!DOCTYPE employees SYSTEM "employees.dtd"> <employees> <employee employeeid="1"> <firstname>Nancy</firstname> ... As you can see, at the top of the XML file, we have put the <!DOCTYPE> declaration. The <!DOCTYPE> declaration is used to attach a DTD to an XML file. The <!DOCTYPE> declaration is immediately followed by <employees> the root element of the document. The SYSTEM declaration specifies the URL of the DTD file that is providing structure to this XML document. In our case, it is employees.dtd. You might be wondering why we created the DTD in Visual Studio. Apart from providing IntelliSense, it is not helping much, is it But wait a moment before you conclude anything, because it has something more to offer. Now, add a new XML file in your project, and add to it the <!DOCTYPE> declaration shown in Listing 5-2. When you start creating the document, you will observe that the IDE shows various elements and attributes in IntelliSense. Figure 5-1 shows how this IntelliSense looks. The IDE also validates your document as you type. It displays error messages if you enter markup or attributes that violate the DTD rules.

Other web page elements that need to be prefixed with a namespace include JavaScript and VBScript functions, JavaScript and VBScript variables, and anything referenced by name using dynamic HTML.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>AJAX Picture Client</title> <script type="text/javascript"> var ajaxRequest var cachedAjaxRequest var currentPic = 100; var theURL; var theCachedURL; function initAJAX() { try { ajaxRequest = new XMLHttpRequest(); cachedAjaxRequest = new XMLHttpRequest(); } catch(error) { ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");