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Figure 7-8: An XML reader lets you access the output records one at a time. When the Transform method gets an output stream to write to, the XSLT processor loops through all the records and accumulates the text into the specified buffer. If an XML reader has been requested, the processor creates an instance of an internal reader class and returns that to the caller. The exact name of the internal reader is System.Xml.Xsl.ReaderOutput. No transformation is performed until the caller explicitly asks to read the cached output records. Figure 7-9 shows how the XSLT processor returns its output.

When UAT was suspended, testers had already logged 55 issues. Brian is also swamped with e-mails from COS stakeholders who want to be kept up to date on the progress of the project. Brian s Excel issue tracking worksheet is no longer sufficient.

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Figure 7-9: The XSLT processor instantiates a reader object and returns. No transformation is performed until you "read" the internal data using the methods and the properties of the returned reader. The XSLT Record Reader The ReaderOutput class builds a virtual XML tree on top of the compiled style sheet, thus making it navigable using the standard XML reader interface. When the Transform method returns, the reader is in its initial state (and therefore it is not yet initialized for reading). Each time you pop an element from the reader, a new output record is properly expanded and returned. In this way, you have total control over the transformation process and can plan and realize a number of fancy features. For example, you could provide feedback to the user, discard nodes based on runtime conditions and user roles, or cause the process to occur asynchronously on a secondary thread. The reader interface exposes the XSLT records as XML nodes the same XML nodes you will find by visiting the output document. The following code snippet demonstrates how to set up a user-controlled transformation: // The XML source must be an XPath document or an XPath navigator XPathDocument doc = new XPathDocument(source); // No arg-list to provide in this case XmlReader reader = xslt.Transform(doc, null); 261

// Perform the transformation, record by record while (reader.Read()) { // Do something } Figure 7-10 shows the user interface of a sample application. It includes a list box control that is iteratively populated with information excerpted from the reader's current node. Each row in the list box corresponds to an output record generated by the XSLT processor.

Simply publishing the issue tracking worksheet as an Excel list would make it easy for testers and developers to enter their information directly. However, built-in functionality in SharePoint Tasks lists would be useful for the COS project team, including the My Tasks, Due Today, and Active Tasks views, and preconfigured alerts for task assignment. Because each issue is a task, it makes sense to modify the existing Tasks list to match Brian s worksheet, then copy and paste the worksheet data into the Tasks list. Site permissions will be used to provide stakeholders with read-only information and prevent them from modifying the issue tracking list. Views can be created for stakeholders, developers, and testers to take the load off Brian s Inbox. Here are the high-level activities required to build the issue tracking solution: 1. Create a Windows SharePoint Services site the COS site for the project team. 2. Modify the columns in the Tasks list to match Brian s issue tracking worksheet. 3. Modify the All Contacts view to include Job Title. 4. Add testers and developers to the Contacts list. 5. Add tester and developer users to the site, either using copy and paste to grab e-mail addresses from the Contacts list, or using the Outlook address book. 6. Create additional list views: Paste a datasheet view used once for importing data Completed issues High priority issues 7. Import the data from the issue tracking worksheet using copy and paste. 8. Modify the home page and launch the site.

To remove rows or columns, select the row or column you would like to delete. Then click Table Delete and specify what to delete.

Figure 7-10: The HTML file generated by the transformation, rendered as a node tree, is received one row at a time. In the reading loop, all nodes are analyzed and serialized to XML text, as shown in the following code. In this way, each row in the list box corresponds to the line of text that is sent to an output stream if you opt for a synchronous transformation. void ReadOutputRecords(XmlReader reader) { // Clear the list box OutputList.Items.Clear(); // Read the records while(reader.Read()) { string buf = ""; switch(reader.NodeType) { case XmlNodeType.Element: buf = String.Format("{0}<{1} {2}>", new String(' ', 2*reader.Depth), 262

reader.Name, GetNodeAttributes(reader)); break; case XmlNodeType.EndElement: buf = String.Format("{0}</{1}>", new String(' ', 2*reader.Depth), reader.Name); break; case XmlNodeType.Text: buf = String.Format("{0}{1}", new String(' ', 2*reader.Depth), reader.Value); break; } OutputList.Items.Add(buf); } } The final text is indented using a padding string whose size depends on the reader's Depth property. Node names and values are returned by the Name and Value properties. For element nodes, attributes are read using a piece of code that we examined in detail in 2: string GetNodeAttributes(XmlReader reader) { if (!reader.HasAttributes) return ""; string buf = ""; while(reader.MoveToNextAttribute()) buf += reader.Value); String.Format("{0}=\"{1}\" ", reader.Name,

You need to modify both the Excel list and the Tasks list so that the data can be copied and pasted. This type of preparation is often necessary when you re creating a new SharePoint

reader.MoveToElement(); return buf; } Output Formats An XSLT style sheet can declare the output format of the serialized text using the <xsl:output> statement. This statement features several attributes, the most important of which is method. The method attribute can be set with any of the following keywords: xml, html, or text. By default, the output format is XML unless the root tag of the results document equals <html>. In this case, the output is in HTML. Differences between XML and HTML are minimal. If the output format is HTML, the XML well-formedness is sacrificed in the name of a greater programmer-friendliness. This means that, for example, empty tags will not have an end tag. In addition to 263

site that will include existing Excel data, so we ll walk through the steps needed to prepare and complete the copy and paste operation. In Excel, use the Replace feature to change the data in the Priority column to match the choices in SharePoint: Replace High with (1) High, Medium with (2) Medium, and so on. Also, replace the tester and developer initials with the users names from the Manage Users page the same names that will appear in the drop-down lists when users add new tasks to the list (see Figure 7-2).

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