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With the XML DOM, a programmer can create an XML document, navigate its structure, and add, modify, or delete its elements. The key to understanding and using the DOM is to grasp the underlying tree structure that is built in the client memory and allows access to the API. The API is the interface to the document and allows the document to be manipulated during parsing. The documentElement is the top level of the tree. The documentElement may contain many branches, which are referred to as nodes. The node interface is the primary datatype for the entire DOM. It represents a single node in the document tree. It may contain a childNode, depending on its de nition (not all allow descendants). Examples of nodes that do not allow children are
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nodeType nodeValue ownerDocument parentNode previousSibling
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Returns the nodeType as a number.
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DOM and SAX
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Returns, or sets, the value of this node, depending on the type. Returns the root node of the document. Returns the parent node for this node. Returns the previous sibling node. Two nodes are siblings if they have the same parent node.
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Table 5-2 Name appendChild(newChild)
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Methods for Use with Nodes Description Appends the node newChild at the end of the child nodes for this node. Returns an exact clone of this node. If the boolean value is set to true, the cloned node contains all the child nodes as well. Returns true if this node has any child nodes. Inserts a new node newNode before the existing node refNode. Removes the speci ed node nodeName. Replaces oldNode with the newNode.
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cloneNode(boolean)
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hasChildNodes() insertBefore(newNode,refNode)
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removeChild(nodeName) replaceChild(newNode,oldNode)
In summary:   Child element A is called the child of element B if and only if element B is the parent of element A. Descendant element A is called a descendant of element B if either element A is a child of element B or element A is the child of element C that is a descendant of element B. Ancestor element A is called an ancestor of element B if and only if element B is a descendant of element A. Sibling element A is called a sibling of element B if and only if elements B and A share the same parent element. Element A is a preceding sibling if it comes before element B in the document tree. Element A is a following sibling if it comes after element B in the document tree.
DOM and SAX
range indicates the content contained between two speci ed end points as one contiguous selection. A range interface confers the advantage of being able to access and manipulate entire portions of a document tree at a higher-level, rather than requiring that the range be decomposed into a sequence of nodes, each of which must be handled separately. See the W3C DOM core for full details. A range is comprised of two boundary points representing the start and end of the range. The positions of the boundary points in a document (or DocumentFragment) tree consist of a starting node address and an o set (or range of nodes within the DOM s internal tree structure). The starting node address becomes the container for the boundary point and its position in the tree. This container and its ancestors are also ancestors to the boundary point and its position in the tree as well, so they may be used for navigation purposes. Likewise, the o set within node becomes the o set of the boundary point and its position in the tree. If the container node is of type Attr, Document, DocumentFragment, Element, or EntityReference, that o set occurs before its child nodes; but if the container node is of type CharacterData, Comment, or ProcessingInstruction (PI), the o set occurs before the string value for the node. The boundary points of a range must share a common ancestor, which is either a Document, DocumentFragment, or Attr node. That is, the content of a range must be entirely within the subtree rooted by a single Document, DocumentFragment, or Attr node. This common ancestor container is known as the root container of the range. The tree rooted by the root container is known as the range s context tree. When navigating XML documents, the traversal-range recommendation de nes two separate interfaces for XML elements. The NodeIterator interface provides methods to move linearly through a document, traversing it from node to node in the order in which they occur. The TreeWalker interface permits traversal of the document as a tree-based structure. To use either of these interfaces, call the create method, and set appropriate ags for elements that should be included in the view. In practice, we would use an application such as Xerces (available from the Apache Software Foundation), which is a Java application that has all the les you need and plenty of documentation. Others are available, of course, from Microsoft, Sun, and other vendors. To traverse a at representation of XML, use the NodeIterator interface. For example, look at this XML document paraphrased from the site: http:// www.onjava.com/pub/a/onjava/2001/02/08/dom.html page=2. <a> <b>first text</b> <c> <d>a child of c</d> <e>another child of c, sibling to d</e> </c> <f>some more text</f>
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