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Other Key Differences
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Other key differences between the Java and the .NET implementation of the DOM API include the following:
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.NET frequently makes use of properties, events, and delegates, whereas Java uses get/set accessors and methods to implement the DOM API. The only way to output a Java DOM Document is to use the Transformer class, discussed in the "XSL Transformations" section later in this chapter, as a conduit to a stream. The .NET XmlDocument class provides the Save, WriteTo, and WriteContentTo methods to simplify the output of DOM trees.
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The .NET Framework provides an API through which components can support XPath queries against underlying data stores. To use the XPath API, it's necessary to understand the XPath
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11. XML Processing
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language, a discussion of which is beyond the scope of this book. The W3C Recommendation "XML Path Language (XPath) Version 1.0," which is available at http://www.w3.org/TR/xpath, contains a complete definition of XPath. This section discusses the .NET Framework classes provided to support XPath. Unless specifically stated otherwise, all XPath classes discussed in this section are members of the System.Xml.XPath namespace.
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IXPathNavigable
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Components provide XPath support by implementing the IXPathNavigable interface, which defines a single method with the following signature:
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XPathNavigator CreateNavigator();
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The XPathNavigator class defines members that support read-only random access to data using XPath expressions. The classes in the .NET Framework that directly implement IXPathNavigable are System.Xml.XmlNode and System.Xml.XPath.XPathDocument. XmlNode is the root class from which some members of the System.Xml namespace are derived, including XmlDocument. The XmlDocument class provides a base class for the System.Xml.XmlDataDocument class, providing XPath access to the data stored in an ADO DataSet.
More Information
We discuss the XmlDocument and XmlNode classes in the "Document Object Model" and "XPath" sections of this chapter, respectively, and the XmlDataDocument class in 16.
XPathDocument
The XPathDocument class implements IXPathNavigable and provides simple and efficient read-only access to an XML document. Optimized for XSLT and XPath manipulation, XPathDocument provides no direct navigation or node management functionality. The primary purpose of the XPathDocument class is to provide an XML cache for access via the XPathNavigator class. XPathDocument instances can be constructed from XML contained in any of the following sources: System.IO.Stream, URI (contained within a String), System.IO.TextReader, or XmlReader. Preservation of white space from the XML source is controlled with the provision of a value from the System.Xml.XmlSpace enumeration.
XPathNavigator
XPathNavigator provides read-only access to an underlying data store as if it were a hierarchy of nodes, conceptually similar to the Document Object Model. The members of
11. XML Processing
XPathNavigator provide the means to navigate through the nodes, obtain information about nodes, and, most important, evaluate XPath expressions against the node set. Navigation through the nodes is via a cursor similar to that provided by XmlReader; the node under the cursor is the current node. Unlike XmlReader, XPathNavigator works against a cached node tree and so supports both backward and forward cursor movements. Using XPath expressions means that sets of nodes meeting specified criteria can be identified and accessed directly.
Node Types
The XPathNavigator.NodeType property returns the node type of the current node, returning a value from the XPathNodeType enumeration. While there is some overlap with DOM and XmlReader, the XPath specification defines a different set of node types. The values contained in the XPathNodeType enumeration are summarized in the following list; those values that are .NET specific and do not form part of the XPath specification are italicized: Root, Element, Attribute, Namespace, Text, ProcessingInstruction, Comment, SignificantWhitespace, Whitespace, and All.
Node Navigation
The XPathNavigator provides a similar, if simplified, set of members to XmlReader to navigate the nodes of the data store. These are summarized in Table 11-18.
Table 11-18. The XPathNavigator Members Used to Navigate Nodes
Comments Takes another XPathNavigator instance as an argument and moves the cursor to point to the current node of the XPathNavigator provided. The success of this method depends on the XPathNavigator implementation and the underlying data store. Moves the cursor to the next sibling of the current node. MoveToNext() MoveToPrevious() Moves the cursor to the previous sibling of the current node. Moves the cursor to the first sibling of the current node. MoveToFirst() MoveToFirstChild() Moves the cursor to the first child node of the current node. Moves the cursor to the parent of the current node. MoveToParent() Moves the cursor to the root node. MoveToRoot() Moves the cursor to a node with the specified ID. This is valid only if the MoveToId() XML document declares attributes of type ID using a DTD.
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