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The principal represents a user (or service, or server) whose identity has been confirmed by the portal. It is distinct from a username, because there is no principal for an unauthenticated user. Note that in practice getRemoteUser() is likely to return null for unauthenticated users anyway, because the authentication process is often the mechanism by which the user is established. The getUserPrincipal() method therefore returns the Principal object associated with the current logged-in user, or null if the user has not been logged in. You may not immediately see the need for a separate object to represent this surely one could use a combination of the username and an isAuthenticated() method However, the principal serves an important purpose when you wish to indicate to another service that our service is entitled to act on behalf of the user in question.

dard practice before XSLT 2.0 has been to use the content type text/xsl. Including several xml-stylesheet processing instructions with different type pseudo-attributes is the best way to ensure that the client will locate the stylesheet.

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You can have multiple xml-stylesheet processing instructions within a document, in which case the client should choose which one to use based on the other pseudo-attributes. In particular, the media pseudo-attribute should contain the type of client that the stylesheet should be used with for example, screen, handheld, or print. However, these additional pseudo-attributes are not well supported in current clients. The simple automatic transformation using the xml-stylesheet processing instruction is often all that you need. However, if you want to do more sophisticated things on the client, such as cache the XML or XSLT documents or pass parameters into the stylesheet, then you need to control the client-side transformation somehow. These kinds of dynamic transformations are essential when creating pages that provide different views of the same XML document, such as tables that you can sort dynamically or applications where you can page through information. Most usually you control the transformation with a script within an HTML page it is this HTML page that the client first requests, and this HTML page that contains the instructions about which XML document and which XSLT stylesheet to use. This pattern is illustrated in Figure 15-3.

To create the new IsolatedStorageSettingsDemo project, open Microsoft Visual Studio 2010 Express for Windows Phone. Select File New Project on the Visual Studio menu, select the Windows Phone Application template on the New Project dialogue, name the application IsolatedStorageSettingsDemo, and click OK, as shown in Figure 13 6. Now you ll build the application main page.

NOTE This sort of situation arises often with portals, because they can aggregate quite distinct systems into a common interface. Take as an example an investment bank s systems. There may be distinct systems for bond and equities trading, and these systems in turn talk to a set of back-end databases. When using a portal to unify the systems, users must first present their credentials to the portal, which in turn establishes a Principal, which is passed to the bond system and the equities system. These in turn use it to gain access to the back-end databases. By using the end user s credentials all the way through the system, a secure audit trail can be maintained, albeit with a performance penalty.

Figure 15-3. Client-side transformation using script within HTML page The biggest drawback with designing applications around client-side transformations is that you have to beware of legacy browsers that don t support XSLT. The six browsers that currently support client-side transformations are listed here: Internet Explorer 5+ Supports client-side transformation to HTML using MSXML; versions 5 and 5.5 require MSXML3 to be installed in replace mode (http://www.microsoft.com/ie), but Internet Explorer 6+ runs out of the box Firefox Supports client-side transformation to HTML using TransforMiiX (http://www.getfirefox.com)

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