how to create barcode in vb net 2012 The Document Object Model: Processing Structured Documents in Java

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The Document Object Model: Processing Structured Documents
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operation, indicates the type of operation being performed The key argument specifies the key for the handler that is being called The data argument contains the data object for which the handler is being called The src argument specifies the node that the data object is attached to (when the node is being deleted, this argument is null) If a new node is being created as part of the operation (that is, it is being cloned), then the dst argument specifies the newly created node The handle() method has no return value
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Determining Relative Document Positions of Nodes
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One of the new features that DOM Level 3 will allow applications to take advantage of is the concept of a node s tree position relative to other nodes in the document In 4 we discussed the concept of document order that is, the order in which nodes appear in the document when they are parsed The Level 3 DOM API provides a new method on the Node interface called compareTreePosition(), which takes a node as an argument The return value of the function is the position in the document tree of the given node relative to the node that this method was called on (also referred to as the reference node) The possible return values from compareTreePosition() are as follows: Return Value
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TREE_POSITION_ANCESTOR TREE_POSITION_DESCENDANT TREE_POSITION_DISCONNECTED
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The given node is an ancestor of the reference node The given node is a descendant of the reference node The two nodes do not have a relationship to each other This occurs when the two nodes are in separate documents The two nodes have an equivalent position This is the case when comparing two attribute nodes that are on the same element The given node follows the reference node in the document The given node comes before the reference node in the document The two nodes are the same When two nodes are the same, they also have an equivalent position
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TREE_POSITION_EQUIVALENT
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TREE_POSITION_FOLLOWING TREE_POSITION_PRECEDING TREE_POSITION_SAME_NODE
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As an example, consider the document tree in Figure 11-2
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11: Future Directions for the DOM
Figure 11-2
Sample document illustrating tree positions of nodes
This document can be described by the following XML code:
<NodeA> <NodeB> <NodeD/> <NodeE/> </NodeB> <NodeC> <NodeF/> <NodeG/> </NodeC> </NodeA>
Suppose you currently had a reference to node F and wanted to know what the relative position of node B was to it The call to compareTreePosition() would be written as
var nodeF, nodeB; // contain references to nodes F and B // nodeF is the reference node, nodeB is the given node nodeFcompareTreePosition(nodeB);
In this example, the return value of compareTreePosition() would be TREE_POSITION_PRECEDING because node B precedes node F (the reference node, in this case) in the document order If the same function were called where the given node was nodeC, the return value would be TREE_POSITION_ANCESTOR
The Document Object Model: Processing Structured Documents
NOTE
The functionality provided by the compareTreePosition() method can also be achieved by using the DOM Level 1 methods and properties This method is provided as a convenience for applications
XPath Support
What Is XPath
Basically, XPath is a way of addressing parts of an XML document In fact, the name XPath is derived from the way that the language uses non-XML path structures to navigate through the structure of an XML document, similar to the way paths are used in regular URLs in Internet addresses For example, consider the following sample XML document, which models what a typical book structure might look like:
<book title="My Book"> <toc /> <chapter name=" 1"> <section>text</section> <section>text</section> </chapter> <chapter name=" 2"> <section>text</section> <section>text</section> </chapter> <chapter name=" 3"> <section>text</section> <section>text</section> </chapter>
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Recently, a lot of activity has been occurring around XPath, which is a W3C Recommendation describing how to declaratively address nodes in an XML file using path-like syntax XPath is finding its way into several W3C specifications, such as XSLT, XPointer, XML Query, and so on DOM Level 3 s XPath module introduces new interfaces for allowing XPath to be used in DOM applications Although it is beyond the scope of this book to provide a full section on XPath, it is worth a brief discussion here to note the functionality available to developers today in certain DOM implementations and to provide an introduction for the support that will be available down the road in the DOM The full XPath specification is available on the W3C website at wwww3org/TR/1999/REC-xpath-19991116html
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