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This example set first selects all the <Employee> nodes whose <title> child node contains the word Representative. Next the returned set is further filtered by discarding all the nodes with an <employeeid> not greater than 7. Accessing the Selected Nodes The SelectNodes method returns the XPath node set through an XmlNodeList data structure that is, a list of references to XmlNode objects. If you need simply to pass on this information to another application module, you can serialize the list to XML using a plain for-each statement and the XmlNode class's OuterXml property. Suppose, instead, that you want to access and process all the nodes in the result set. In this case, you set up a recursive procedure, like the following LoopThroughChildren routine, and start it up with a for-each statement that touches on the first-level nodes in the XPath node-set: foreach(XmlNode n in nodes) LoopThroughChildren(writer, n); The following procedure is designed to output the node contents to an XML writer, but you can easily modify the procedure to meet your own needs. void LoopThroughChildren(XmlTextWriter writer, XmlNode rootNode) { // Process the start tag if (rootNode.NodeType == XmlNodeType.Element) { writer.WriteStartElement(rootNode.Name); // Process any attributes foreach(XmlAttribute a in rootNode.Attributes) writer.WriteAttributeString(a.Name, a.Value); // Recursively process any child nodes foreach(XmlNode n in rootNode.ChildNodes) LoopThroughChildren(writer, n); // Process the end tag writer.WriteEndElement(); } else // Process any content text if (rootNode.NodeType == XmlNodeType.Text) writer.WriteString(rootNode.Value); } This version of the LoopThroughChildren routine is an adaptation of the routine we analyzed in 5.

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A Better Way to Select a Single Node In the section "The SelectSingleNode Internal Implementation," on page 255, I pointed out that SelectSingleNode is not as efficient as its signature and description might suggest. This XML DOM method is expected to perform an XPath query and then return only the first node. You might think that the method works smartly, returning to the caller as soon as the first node has been found. Unfortunately, that isn't what happens. SelectSingleNode internally calls SelectNodes, downloads all the nodes (potentially a large number), and then returns only the first node to the caller. The inefficiency of this implementation lies in the fact that a significant memory footprint might be required, albeit for a very short time. So in situations in which you need to perform an XPath query to get only a subset of the final node-set (for example, exactly one node), you can use a smarter XPath expression. The basic idea is that you avoid generic wildcard expressions like the following: doc.SelectSingleNode("NorthwindEmployees/Employee"); Instead, place a stronger filter on the XPath expression so that it returns just the subset you want. For example, to get only the first node, use the following query: doc.SelectSingleNode("NorthwindEmployees/Employee[position() = 1"); The same pattern can be applied to get a matching node in a particular position. For example, if you need to get the nth matching node, use the following expression: doc.SelectSingleNode("NorthwindEmployees/Employee[position() < n+1"); Using such XPath expressions with SelectSingleNode does not change the internal implementation of the method, but those expressions require downloading a smaller subset of nodes prior to returning the first matching node to the caller. The same XPath expression, if used with SelectNodes, returns a subset of the first n matching nodes: doc.SelectNodes("NorthwindEmployees/Employee[position() < n+1");

The Print Preview box will show you how the table of contents will appear in final form. Word will not show the actual headings in the Print Preview box. Rather, it shows the position of the different heading levels, substituting Heading 1, Heading 2, and so forth in place of headings. Word has six predefined formats for you to choose. You can also opt to apply text formatting from the document template, which allows you to base the formatting on styles you specify. The predefined formats will save you some time. However, they may not be appropriate for a business proposal. If you decide to use one, opt for the Classic format. You are also able to change certain elements in the table of contents. You can alter the appearance of page numbers and leader lines and select how many levels the table of contents will contain. With a professional document such as a business proposal, you should emphasize function over form. So design the table of contents with readability in mind. Page numbers are a necessity, so make sure to select Show page numbers in the Index and Tables dialog box. You probably also want to select Right align page numbers, as this will give the table a clean, organized look. If you align the page numbers along the right margin, you will do well to add tab leader lines, which will guide the reader s eye to the correct page number. Of course, Word provides a few different choices for how the leader lines appear. A dotted leader line is both unobtrusive and effective. Use the drop-down box to select the style you want.

The XML DOM support for XPath expressions has a double goal. First, it smooths the transition from MSXML COM code to the .NET Framework. Second, it gives you a builtin and easy-to-use mechanism to search for nodes in a memory-mapped XML document. As mentioned, the core .NET API for processing XPath expressions is built into a tailor-made class named XPathNavigator. You access the navigator object either from the XmlDocument class or from the newest XPathDocument class. Figure 6-5 illustrates the relationship between the two ways of accessing XPath functions in the .NET Framework.

Formulas add extra functionality to a SharePoint list. The list is no longer a static data repository, but an active part of your collaboration work with your team. Much of the same functionality you have in Excel is available in SharePoint lists. You can apply formulas using references, operators, constants, and functions. SharePoint offers 150 functions, from simple math functions such as SUM to complex statistical functions such as DEVSQ (returns the sum of squares of deviations of data points from their sample mean). In this chapter, we identified many of the most commonly used and most helpful functions. In a SharePoint list, you can add column totals to a list, but you cannot create formulas based on these totals. Formulas can be based only on data within a row, not on column data. To combine multiple functions into one formula, you can create nested functions. SharePoint isn t helpful in identifying the possible source of an error in a formula, so by constructing the formula in steps, you can test each part of the formula as you go along. In 6, we ll look at options for publishing Excel workbooks as web pages to a SharePoint site.

Figure 6-5: Applications can access XPath through either XmlDocument or XPathDocument. In both cases, the actual query is performed by a .NET XPath navigator object. As you can see, the XmlDocument and XPathDocument classes have different internal layouts. XmlDocument implements XML DOM, whereas XPathDocument provides a more agile and compact structure, designed to speed XPath-driven navigation. (Later in this chapter, in the section "The XPathDocument Class," on page 281, I'll have more to say about this.) No matter the application-level API, the sequence of steps necessary to execute XPath queries on an XML data source is always the same: 1. Get a reference to an XPath-enabled document class (for example, an instance of an XPathDocument or XmlDocument class). 2. Create a navigator object for the class instance. 217

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