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As a general rule, indent when you open a new element, because this will allow you to see the document s structure and notice if you accidentally close the wrong element first XML documents must start with an XML declaration like < xml version="10" > This signals that the document contains XML and indicates any special text encoding However, many XML parsers work fine even if this detail is omitted These requirements should sound familiar they re the same rules you learned for XHTML in 4 After all, XHTML is just another specialized language that s built using the standardized rules of XML As long as you meet these requirements, your XML document can be parsed and displayed as a basic tree This means your document is well formed, but it doesn t mean it is valid.

Figure 8-10. A munged URL with the session ID Because the session ID is inserted in the current URL, relative links also automatically gain the session ID. In other words, if the user is currently stationed on Page1.aspx and clicks a relative link to Page2.aspx, the relative link includes the current session ID as part of the URL. The same is true if you call Response.Redirect() with a relative URL, as shown here: Response.Redirect("Page2.aspx"); Figure 8-11 shows a sample website (included with the online samples in the CookielessSessions directory) that tests cookieless sessions. It contains two pages and uses cookieless mode. The first page (Cookieless1.aspx) contains a HyperLink control and two buttons, all of which take you to a second page (Cookieless2.aspx). The trick is that these controls have different ways of performing their navigation. Only two of them work with cookieless session the third loses the current session.

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For example, you may still have your elements in the wrong order (for example, <ID><Product> </Product></ID>), or you may have the wrong type of data in a given field (for example, <ID>Chair</ID><Name>2</Name>) You can impose these additional rules on your XML documents, as you ll see later in this chapter when you consider XML schemas Elements are the primary units for organizing information in XML (as demonstrated with the SuperProProductList example), but they aren t the only option You can also use attributes..

Figure 8-11. Three tests of cookieless sessions The HyperLink control navigates to the page specified in its NavigateUrl property, which is set to the relative path Cookieless2.aspx. If you click this link, the session ID is retained in the URL, and the new

Attributes add extra information to an element. Instead of putting information into a subelement, you can use an attribute. In the XML community, deciding whether to use subelements or attributes and what information should go into an attribute is a matter of great debate, with no clear consensus. Here s the SuperProProductList example with ID and Name attributes instead of ID and Name subelements: < xml version="1.0" > <SuperProProductList> <Product ID="1" Name="Chair"> <Price>49.33</Price> <Available>True</Available> <Status>3</Status> </Product>

page can retrieve the session information. This demonstrates that cookieless sessions work with relative links. The two buttons on this page use programmatic redirection by calling the Response.Redirect() method. The first button uses the relative path Cookieless2.aspx, much like the HyperLink control. This approach works with cookieless session state and preserves the munged URL with no extra steps required. protected void cmdLink_Click(Object sender, EventArgs e) { Response.Redirect("Cookieless2.aspx"); } The only real limitation of cookieless state is that you cannot use absolute links (links that include the full URL, starting with http://). The second button uses an absolute link to demonstrate this problem. Because ASP.NET cannot insert the session ID into the URL, the session is lost. protected void cmdLinkAbsolute_Click(Object sender, EventArgs e) { Response.Redirect("http://localhost:56371/CookielessSessions/Cookieless2.aspx"); } Now the target page (Figure 8-12) checks for the session information but can t find it.

The previous examples demonstrated using the elements for DocBook chapters, sections, and paragraphs. You can use many more elements to create comprehensive documentation. Here, we ll look at the more commonly used elements. For detailed information, see http:// www.docbook.org and http://docbook.sourceforge.net.

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