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Tip You may still wonder why it makes sense to create the table of contents now. The answer is simple. You can use the table of contents to navigate through your document because it is linked to the sections of the business proposal. Simply hold the mouse pointer over one of the entries in the table of contents. Then hold the Ctrl key and click the mouse. Word takes you to that section of your document.

Count; }catch{} if (nodes == null || nodeCount <= 0) buf = "<results>No nodes selected</results>"; else buf = BuildOutputString(nodes); ShowResults(buf, nodeCount); The results of the XPath query are rendered as an XML document The root node is <results>, which contains the outer XML code of each node found Post-Processing the Node-Set Post-processing the output of an XPath query is a relatively common task if you have to transfer the results to a different process or machine In similar situations, you don't have formatting concerns and can quickly arrange a final XML document, as follows: 211.

=ROUND(SUM[Column1],[Column2],[Column3]))

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StringBuilder sb = new StringBuilder("<results>"); foreach(XmlNode n in nodes) sb.Append(n.OuterXml); sb.Append("</results>"); return sb.ToString(); Our sample application intentionally follows a more sophisticated approach to display formatted output in the text box. In addition, this code turns out to be a useful exercise for understanding the logic of XML writers. If you want to generate XML output in the .NET Framework, unless the text is short and straightforward, you have no good reason for not using XML writers. Using XML writers also provides automatic and free indentation. Don't think that choosing an XML writer ties you to using a specific output stream. As the following code demonstrates, the output of an XML writer can be easily redirected to a string: string BuildOutputString(XmlNodeList nodes) { // Create efficiency, a string writer to hold the XML text. For

Using the order of operations, this sums the three columns and then applies the ROUND function to the result. SharePoint isn t very helpful in suggesting where an error exists in a formula. When creating formulas with nested functions, you might want to create them in stages, testing each part of the formula as you go along. In the example in the previous paragraph, you could create the SUM function and review the results in the column. If it s correct, you could then add the ROUND function to the formula. In this way, you can narrow down the possible errors as you go along.

// the string writer is based on a StringBuilder object. StringBuilder sb = new StringBuilder(""); StringWriter sw = new StringWriter(sb); // Instantiate the XML writer XmlTextWriter writer = new XmlTextWriter(sw); writer.Formatting = Formatting.Indented; // Write the first element (No WriteStartDocument call is needed) writer.WriteStartElement("results"); // Loop through the children of each selected node and // recursively output attributes and text foreach(XmlNode n in nodes) LoopThroughChildren(writer, n); // Complete pending nodes and then close the writer writer.WriteEndElement(); writer.Close(); // Flush the contents accumulated in the string writer return sw.ToString(); } Let's see what happens when we process the following XML document: <MyDataSet> 212

<NorthwindEmployees> <Employee> <employeeid>1</employeeid> <lastname>Davolio</lastname> <firstname>Nancy</firstname> <title>Sales Representative</title> </Employee> </NorthwindEmployees> </MyDataSet> This document is the same XML representation of the Northwind's Employees database that we used in previous chapters. To see the application in action, let's set MyDataSet (the root) as the context node and try the following expression: NorthwindEmployees/Employee[employeeid > 7] The XPath query has two steps. The first step restricts the search to all the <NorthwindEmployees> nodes in the source document. In this case, there is only one node with that name. The second step moves the search one level down and then focuses on the <Employee> nodes that are children of the current <NorthwindEmployees> context node. The predicate [employeeid > 7] includes in the final result only the <Employee> nodes with a child <employeeid> element greater than 7. The following XML output is what XPath Evaluator returns: <results> <Employee> <employeeid>8</employeeid> <lastname>Callahan</lastname> <firstname>Laura</firstname> <title>Inside Sales Coordinator</title> </Employee> <Employee> <employeeid>9</employeeid> <lastname>Dodsworth</lastname> <firstname>Anne</firstname> <title>Sales Representative</title> </Employee> </results> Figure 6-4 shows the user interface of XPath Evaluator when it is set to work on our sample document and expression.

Note The most common error when creating nesting formulas is omitting the closing parentheses at the

To insert your table of contents, place the cursor at the beginning of the first line of your outline. Then click Insert Reference Index and Tables to bring up the Index and Tables dialog box. Open the Table of Contents tab, as shown in Figure 8-5.

Figure 6-4: The node set returned by XPath Evaluator. Note The preceding expression is an abbreviated form that could have been more precisely expressed as follows: NorthwindEmployees/Employee/self::*[child::employeeid > 7] You apply the predicate to the context node in person (self) and verify that the employeeid node on its children has a value greater than 7.

The contents of the final node-set is determined by the node that appears in the last step of the XPath expression. Predicates allow you to perform a sort of forward checking that is, selecting nodes at a certain level but based on the values of child nodes. The expression NorthwindEmployees/Employee[employeeid > 7] is different from this one: NorthwindEmployees/Employee/employeeid[node() > 7] In this case, the node set consists of <employeeid> nodes, as shown here: <results> <employeeid>8</employeeid> <employeeid>9</employeeid> </results> Concatenating Multiple Predicates An XPath expression can contain any number of predicates. If no predicate is specified, child::* is assumed, and all the children are returned. Otherwise, the conditions set with the various predicates are logically concatenated using a short-circuited AND operator. Predicates are processed in the order in which they appear, and the next predicate always works on the node-set generated by the previous one, as shown here: Employee[contains(title, 'Representative')][employeeid >7]

end of each function. Excel automatically prompts you to fix this error; SharePoint does not. You have to figure out the error for yourself.

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