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Figure 6-2: A location path consists of one or more location steps, each of which can be expressed in full or abbreviated form. Consider the following three-step expression: invoices/descendant::invoice[@year = 2002]/child::country[text() = 'USA'] The first step selects all the nodes named <invoices> below the context node. This node-set is then passed as the context node-set to the next location step. The second location step is expressed in an unabbreviated form and loops through all the descendants of each previously selected <invoices> node. When processed, each node plays the role of the context node and provides different position information. At the end of the second step, the node-set contains only the <invoice> nodes that have a parent <invoices> and a year attribute set to 2002. The final step further narrows the node-set by excluding all the nodes that have no <country> child whose text equals USA. Note The at sign (@) that you use to indicate a node attribute is actually an abbreviation for another particular axis type: the attribute. The full syntax for the year attribute is attribute::year. The XPath specification recommends a number of abbreviations that are commonly used in coding, including the following shortcuts: Use a period (.) to indicate the context node and two periods (..) to refer to the parent. When no axis is specified, child:: is assumed. Finally, [n] means the nth node in the current context node-set; this array-like notation is equivalent to [position() = n].

ISNA(value)

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Links Between Documents The XPath query language is used to select a set of nodes in a given XML document. You typically use XPath to search for nodes in an XML DOM implementation of a data source and to filter the nodes to which a given transformation template in an XSL script must be applied. Recently, another possible use for the XPath syntax has boldly emerged. I'm talking about XPointer, which is designed to become the standard way to link portions of external documents to XML documents. What Is XPointer XPointer is used to locate data within an XML document. When XML documents need to point to external resources, they can declare an entity reference or, more effectively, include the whole resource, using the XML Inclusion (XInclude) syntax. XInclude a W3C recommendation candidate links the host document to an external resource, or a portion of it. XPointer defines the syntax you use to specify the addressed portion of the document. Normally, to indicate a particular position in an XML document, you attach a fragment identifier to the document's URL. A fragment identifier is marked by a number sign (#) and follows the document's URL. For example, the URL http://www.w3.org/TR/xptr/#conformance points to the portion of the document labeled with the conformance name. With XPointer, you can use the XPath syntax to identify with greater flexibility a particular location in the external document. 207

How XPointer Uses XPath An XPointer fragment identifier can be the name of a particular portion of the target document, but it could also be a more complex and expressive XPath query. For example, you could link a piece of information using the following syntax: invoices.xml#xpointer(/descendant::invoice[@id=201]) This expression references the particular descendant node named <invoice> having an id attribute equal to 201.

=ISNA ([MiddleName])

the plus sign in the margin. If you want to collapse your entire outline, use the Outlining toolbar. The Show Level drop-down box allows you to select the levels you would like to view. You can select Levels 1 through 9, as listed in Figure 8-4, or you can opt to show all levels.

In the NET Framework, you can make use of XPath expressions in two ways: through the XML DOM or by means of a new and more flexible API based on the concept of the XPath navigator In the former case, you use XPath expressions to select nodes within the context of a living instance of the XmlDocument class As we saw in 5, the XmlDocument class is the NET Framework class that renders a given XML document as a hierarchical object model (XML DOM) This approach keeps the API close to the old MSXML programming style and has probably been supplied mostly for compatibility reasons The alternative approach consists of creating an instance of the XPathDocument class and obtaining from it an XPath navigator object The navigator object is a generic XPath processor that works on top of any XML data store that exposes the IXPathNavigable interface.

Rendered through the XPathNavigator class, the XPath navigator object parses and executes expressions using its Select method XPath expressions can be passed as plain text or as preprocessed, compiled expressions As you can see, although the classes involved are different, the overall programming style is not much different from those pushed by MSXML and the NET Framework XML DOM classes This said, though, the XPath navigator object represents a quantum leap from the SelectNodes method of the XmlDocument class For one thing, it works on top of highly specialized document classes that implement IXPathNavigable and are optimized to perform both XPath queries and XSL transformations In contrast, the XmlDocument class is a generic data container class that incorporates an XPath processor but is not built around it Several classes in the NET Framework implement the IXPathNavigable interface, thus making their contents automatically selectable by XPath expressions.

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We'll look at the navigation API in more detail in the section "The NET XPath Navigation API," on page 263 For now, let's review the XPath support built into the XmlDocument class The XML DOM Node Retrieval API When using XPath queries to query an XML DOM instance, you can use the SelectNodes method of the XmlDocument class In particular, SelectNodes returns a collection that contains instances of all the XmlNode objects that match the specified expression If you don't need the entire node-set, but instead plan to use the query to locate the root of a particular subtree, use the SelectSingleNode method SelectSingleNode takes an XPath expression and returns a reference to the first match found The SelectNodes and SelectSingleNode methods perform identical functionality to the methods available from the Component Object Model (COM) based MSXML library that script and Microsoft Win32 applications normally use.

=ISNONTEXT ([FlightMiles]

It is worth noting that these 208.

If you need to change the order of one of the headings, click the plus or minus sign in the margin. Then drag it to the correct location. When you move a level, you will also move the sublevels that have been highlighted.

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