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NET Framework provides several reader classes with and without validation capabilities Valid sources for an XML reader are disk files as well as any flavor of NET streams and text readers (for example, string readers) An OOP Refresher Throughout this book, I'll often use terms such as interface and class, sometimes qualified by helper adjectives such as abstract or base Although a full explanation of these terms and their related object-oriented programming (OOP) concepts is beyond the scope of this book, a quick terminology refresher will help you get to the heart of the XML class hierarchy in the NET Framework In the NET Framework, an interface is a container for a named collection of method, property, and event definitions referred to as a contract An interface can be used as a reference type, but it is not a creatable type Other types can implement one or more interfaces.

You re now ready to create the calculated Brand column using the following formula:

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In doing so, they adhere to the interface's contract and agree to provide actual implementation for all the methods, properties, and events in the contract A class is a container that can include data and function members (methods, properties, events, operators, and constructors) Classes support inheritance from other classes as well as from interfaces Any class from which another class inherits is called a base class An abstract class simply declares its members without providing any implementation Like interfaces, abstract classes are not creatable but can be used as reference types An abstract class differs from an interface in that it has a slightly richer set of internal members (constructors, constants, and operators) Members of an abstract class can be scoped as private, public, or protected, whereas members of an interface are mostly public In addition, child classes can implement multiple interfaces but can inherit from only one class 21.

The XmlReader Class The XmlReader class defines methods that enable you to pull data from an XML source and to skip unwanted nodes Bear in mind that each and every element in an XML stream is considered a node, meaning that node is a rather generic concept that applies to subtree roots as well as to attributes, processing instructions, entities, comments, and plain text The XmlReader class includes methods for reading XML content from an entire text file, returning the depth of the current XML node's subtree, and determining whether the contents of a given element is empty You can also fairly easily read and navigate attributes and skip over elements and their contents Valuable information such as the name and the contents of the current node is also returned via ad hoc properties Base Properties of XML Readers Table 2-1 lists the public properties exposed by the XmlReader class.

=IF(ISERROR([Caps]),REPLACE([Item],1,0,"TopWear "),REPLACE([Item],1,0,"FabWear "))

the exception of Print Layout view, the document views do not accurately represent how your finished document will appear. Keep this in mind as you work. If you need to gauge how your finished document will look, you can toggle back and forth between document views via the View menu or the view buttons in the lower left of the Word window. The Print Preview button on the Standard toolbar also shows you how your document will look.

Notice that the values these properties contain depend on the actual reader class you are using in your code The description of each property refers to the property's intended goal, but this description might not entirely reflect the actual role of the property in a derived reader class Table 2-1: Public Properties of the XmlReader Class Property Description AttributeCount Gets the number of attributes on the current node BaseURI CanResolveEntity Depth EOF HasAttributes HasValue IsDefault Gets the base URI of the current node Gets a value indicating whether the reader can resolve entities Gets the depth of the current node in the XML document Indicates whether the reader has reached the end of the stream Indicates whether the current node has any attributes Indicates whether the current node can have a value.

Indicates whether the current node is an attribute that originated from the default value defined in the document type definition (DTD) or schema Indicates whether the current node is an empty element with no attributes or value Indexer property that returns the value of the specified attribute Gets the name of the current node with any prefix removed Gets the fully qualified name of the current node Gets the namespace URI of the current node Applies to Element and Attribute nodes only Gets the name table object associated with the reader (More on name table objects later) Gets the type of the current node 22.

This formula starts with an IF statement that evaluates if the Caps column displays an error, using the ISERROR function (this error is represented by #VALUE!). If it does, the formula uses the REPLACE function to insert TopWear at the first position in the string. If it doesn t, it inserts FabWear into the first position of the string. Figure 5-5 shows the results of this formula.

XML sprang to life as a metalanguage that can be used to describe any sort of data and documents using a truly hierarchical representation, or a representation that simply looks hierarchical As XML gained broad acceptance from the software industry, the need for additional and related standards promptly arose In 5, we looked at the XML Document Object Model (XML DOM), which represents the official object model for XML data containers Although it is rich and powerful, XML DOM alone does not address the needs of XML data retrieval One of the key advantages of XML markup text over plain text is that it can be used to mark portions of the text with special tags and attributes.

Figure 5-5. In this list, the Caps columns identifies the items that contain the text string cap, and the Brand column shows the results of applying the appropriate brand names to the items.

So how do you effectively retrieve parts of an XML document that have been marked in a certain way The need for an effective XML-based query language is as old as the need for a general-purpose data description language In fact, a W3C-ratified standard for an XML query language followed shortly after the XML 10 recommendation XPath is the query language defined to address parts of an XML document using a compact, relatively simple, but not XML-based syntax More importantly, XPath is designed to define and provide a common syntax for accessing XML nodes through the XML DOM as well as from XML Stylesheet Language Transformation (XSLT) scripts (We'll look at XSLT in 7) In the Microsoft NET Framework, XPath is fully supported through the classes defined in the SystemXmlXPath namespace The .

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