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<xsl:attribute name="URL"> <xsl:value-of select="@url"/> </xsl:attribute> <xsl:apply-templates /> </xsl:element> </xsl:template> </xsl:stylesheet> The style sheet transforms a <node> element to a <MenuItem> element. Further, it transforms the text and url attributes to the Title and URL attributes, respectively. To test how the TransformFile property works, you need to modify the preceding example by following these steps: 1. Add a new XSLT file named Navigation.xsl into the website. 2. Key in the markup shown in Listing 11-14. 3. Set the TransformFile property of the XML data source control to Navigation.xsl. 4. Open the TreeView DataBindings Editor of the TreeView and modify the data bindings to use the MenuItem node as DataMember, Title as TextField, and URL as NavigateUrlField. This time, the TreeView DataBindings Editor looks like Figure 11-12.

Response.Redirect(http://someserver/somepage.htm);

The ChartDeleter works only with files in the Java temporary file directory. At any time, the portlet can ask the ChartDeleter if a chart is on the deletion list, using the isChartAvailable() method:

You will observe that although the DataFile property is still Navigation.xml, the data bindings shown are as per the transformation specified in the XSLT style sheet. If you run the web form again, the output should be the same as in Figure 11-11 earlier.

public boolean isChartAvailable(String filename)

You can find more details here: http://msdn2.microsoft.com/en-us/library/system. web.httpresponse(VS.80).aspx.

Portal implementations usually involve a wide variety of interesting technical problems. Because they are generally systems for integrating a range of business systems, content stores, and web applications, the goals for the portal project are usually specific to the installation. Some of the goals that typically come up are integrating a search engine with the portal and providing an SSO interface for security. Other common development tasks for portal projects include extending personalization across all of the portal s applications, integrating content management systems, and creating portlets for systems that were not designed for portals. In this book, we discuss all of these problems, plus several others, and provide solutions that work within a portal environment. Our hope is that you will be able to take our solutions and make them work for your problems.

At times you may wish to filter the data from the source XML file and bind the filtered data to other controls. This is where the XPath property of the XML data source control comes in. The XPath property takes a valid XPath expression and applies it to the source XML data. Suppose, for example, that you wish to display only product-related nodes in the TreeView. You can achieve this by setting the XPath property of the XML data source to /node/node[@text="Products"]. This way, only the product-related nodes (Products, Product 1, Product 2, and Product 3) will be filtered. The TreeView will have nesting up to two levels only (Products as the top node, and the other three nodes as child nodes). Figure 11-13 shows a sample run of the same web form after setting the XPath property.

Summary

The portlet API has a basic security model based on the servlet security model. Security is an area that is going to depend heavily either on the proprietary features of your chosen portal, or on leveraging a third-party product that can handle a unified security model. Single Sign-On is a key requirement for most portal projects, and we cover the different strategies that can be used for SSO projects. We cover SSO in 8.

One common requirement for a portal deployment is to implement content syndication on the portal for multiple sources of content. This content could be from a content management system; from an internal groupware application; or from external sources like Reuters, Yahoo!, or CNN. In this book, we discuss using the RSS format for syndicating content on channels. The RSS portlet can consume RSS feeds that other sites publish. We also discuss the mechanics of publishing an RSS feed for an existing content store. Our search engine integrates with RSS, so a content feed constantly updates a list of the top hits for a given search. This is useful for creating ad hoc knowledge management systems within your organization. We will discuss RSS and content syndication in more detail in 9.