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methods are not part of the official W3C XML DOM specification but represent, instead, Microsoft extensions to the standard XML DOM At the application level, XML DOM methods and the XPath navigator supply different programming interfaces, but internally they run absolutely equivalent code The SelectNodes Internal Implementation The SelectNodes method internally employs a navigator object to retrieve the list of matching nodes The return value of the navigator's Select method is then used to initialize an undocumented internal node list class named SystemXmlXPath XPathNodeList As you have probably guessed, this class inherits from XmlNodeList, which is a documented class To verify this statement, compile and run the following simple code: XmlDocument doc = new XmlDocument(); docLoad(fileName); XmlNodeList nodes = docSelectNodes("child::*"); ConsoleWriteLine(nodesToString()); The true type of the variable nodes is XPathNodeList.

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If you try to reference that type in your code, you get a compile error due to the protection level of the class What's the difference between using SelectNodes and the XPath navigator object The SelectNodes method uses a navigator that works on top of a generic XML document class the XmlDocument class The SelectNodes method's navigator object is, in fact, created by the XmlDocument class's CreateNavigator method If you choose to publicly manage a navigator, you normally create it from a more specific and XPath-optimized document class the XPathDocument class The XPath expression is passed to the navigator as plain text: XmlNodeList SelectNodes(string xpathExpr, XmlNamespaceManager nsm) Interestingly enough, however, if you use this overload of the SelectNodes method that handles namespace information, the XPath expression is first compiled and then passed to the processor.

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As we'll see in the section "Compiling Expressions," on page 274, only compiled XPath expressions support namespace information In particular, they get namespace information through an instance of the XmlNamespaceManager class The SelectSingleNode Internal Implementation The SelectSingleNode method is really a special case of SelectNodes Unfortunately, there is no performance advantage in using SelectSingleNode in lieu of SelectNodes The following pseudocode illustrates the current implementation of the SelectSingleNode method: public XmlNode SelectSingleNode(string xpathExpr) { XmlNodeList nodes = SelectNodes(xpathExpr); return nodes[0]; } The SelectSingleNode method internally calls SelectNodes and retrieves all the nodes that match a given XPath expression Next it simply returns the first selected node to 209.

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the caller. Using SelectSingleNode perhaps results in a more easily readable code, but doing so certainly does not improve the performance of the application when you need just one node. In the next section, we'll build a sample Microsoft Windows Forms application to start practicing with XPath expressions, thus turning into concrete programming calls all that theory about the XPath query language. The Sample XPath Evaluator The sample XPath Evaluator application is a Windows Forms application that loads an XML document and then performs an XPath query on it. The application's user interface lets you type in both the context node and the query string. Next it creates an XML DOM for the document and calls SelectNodes. The output of the expression is rendered as an XML string rooted in an arbitrary <results> node, as shown here: <results> ... XML nodes that match ... </results> The sample application is shown in Figure 6-3. You can find the code listing for this application in this book's sample files.

Once you have created your outline, you re ready for the table of contents. You may find it counterintuitive to create the table of contents before the rest of the document. When you create a table of contents manually, it makes sense to insert it when the document is finalized. That way, you don t need to worry about updating page numbers. Word will create a table of contents automatically. By using this feature, you will avoid the problems associated with creating one manually. First, Word uses the headings you entered in Outline view to create the table of contents. You won t need to waste time entering the information a second time. Word also makes it easy to format the table, providing several predefined options. But, best of all, Word will automatically update the page numbering for you. So, as your document grows in length, the table of contents will reflect the changes.

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Figure 6-3: The XPath Evaluator sample application in action. Initializing the Application When the user clicks the Load button, a StreamReader object is used to load the specified XML document and refresh the left text box, which displays the contents of the XPath source document. I used the I/O API to read the document to preserve the newline characters. An alternative approach consists of loading the document into the XmlDocument class and then getting the source through the document element's OuterXml property. In this case, however, what you get is a string of contiguous characters that does not display well in a fixed-width text box.

Setting the Context Node As mentioned, the context node is the starting point of the query The context node is important if you specify a relative expression In this case, the context node that is, the XmlNode object from which you call SelectNodes determines the full path The context node is simply ignored if the expression contains an absolute location path, in which case, the path must start from the XML root node The sample application first initializes the XML DOM and then sets the context node by calling SelectSingleNode on the document object For the sake of generality, this application's user interface accepts a reference to the context node using an XPath expression, as shown here: XmlDocument doc = new XmlDocument(); docLoad(xmlFile); XmlNode cxtNode = docSelectSingleNode(ContextNode.

Although it s possible to create multiple columns to create formulas that are based on the results of a function, you can also nest functions into one formula. SharePoint supports up to eight levels of nested functions. To nest a function, you include a secondary function inside the primary function. For example, if you want to sum three columns and then round the result, you d create a formula similar to the following:

Text); In a real-world situation, you normally know what the context node is (typically, the XML document root) and can locate it more efficiently using the ChildNodes collection For example, the following code shows how to set the context node to the document's root: XmlNode cxtNode = docDocumentElement; XmlNodeList nodes = cxtNodeSelectNodes(xpathExpr); Performing the XPath Query After you type the XPath expression, you click the Eval button to run the query Note that the node names in an XPath expression are case-sensitive and must perfectly match the names in the original source document After the processor has processed the node list, the output string is built by calling the BuildOutputString method and then displayed in the form's results panel via the ShowResults method, as shown here: string buf = ""; int nodeCount = 0; XmlNodeList nodes = null; try { nodes = cxtNodeSelectNodes(xpathExpr); nodeCount = nodes.

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