how to create barcode in vb net 2012 3: Navigating and Manipulating Structured Documents in Java

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3: Navigating and Manipulating Structured Documents
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This next example shows the effect of removing the newly inserted node
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In this case, the reference node is not affected, so there is no change to the iterator or its position When the reference node itself is the one being removed from the tree, a new reference node must be selected The way this is done depends upon the current position of the iterator with respect to the current reference node Suppose, for example, that node3 is the current reference node, and the iterator s position is between node3 and node4, as in the following example (this is usually what happens when nextNode() is called)
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If node3 is removed from the document, a new reference node must be selected Because the iterator s position is currently after the reference node, it will remain so when the new reference node is selected Node2 is the nearest node that precedes the iterator s position, so it is selected as the new reference node, as illustrated here
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If, on the other hand, the iterator s position is before the current reference node (between node2 and node3), as it would be if previousNode() had just been called, and the reference node were removed, the nearest node that is after the iterator s position would be selected as the new reference node In this case, node4 would become the new reference node, as shown next
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There are two special cases that arise when removing the reference node The first is when the reference node is the last node in the list and the position is before the node, as shown here, where node6 is the reference node
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The Document Object Model: Processing Structured Documents
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In this case, when node6 is removed, the rules state that the new reference node should become the nearest node following the position However, because there is no next node, the new node becomes the nearest node preceding the position (node5), as shown next
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The second special case is when the reference node is the first node in the list and the position is after the reference node, as shown here where node1 is the reference node
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In this case, the rules state that when node1 is removed, the new reference node should be the nearest node preceding the iterator position Again, there is no node that precedes the position, so the new reference node becomes the node that follows the position (node2), as shown next
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Things get a little trickier when nodes that are outside of the logical view come into play The reason is this: even though a node may not be included in a NodeIterator s logical view, it may still become the reference node Consider the following example: suppose that node3 is not in the logical view of the document subtree represented by the NodeIterator, and that node4 is the current reference node, as shown here
If the current iterator position is after the reference node, and the reference node is removed, the nearest node before the position becomes the new reference node This is true regardless of whether the node is actually in the logical view Thus, if node4 is removed from the subtree, node3 will become the new reference node, as shown next
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3: Navigating and Manipulating Structured Documents
Nodes that aren t in the logical view cannot be skipped when choosing a new reference node because the wrong results may occur For instance, if a new node named node7 that is visible in the logical view was inserted after node3, then the document subtree would look like the following example
Now, if previousNode() is called, node7 will be returned, as would be expected If node3 had been skipped over and node2 was selected as the new reference node, then the new node would not have been returned as the previous node which would be incorrect because, as far as the iterator s user was concerned, node7 would have been the previous node had node4 not been removed Of course, once the NodeIterator s reference node changes from the node that is not in the logical view, you will not be able to return to it using the NodeIterator s methods because it will be skipped by the whatToShow setting or any associated NodeFilter s logic
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