NodeFilter
The whatToShow argument allows you to iterate over only certain node types in a subtree. Suppose you want to go beyond that. For example, you may have a program that reads XHTML documents and extracts all heading elements but ignores everything else. Or perhaps you want to find all SVG content in a document, or all the GIFT elements whose price attribute has a value greater than $10.00. Or perhaps you want to find those SKU elements containing the ID of a product that needs to be reordered, as determined by consulting an external database. All of these tasks and many more besides can be implemented through node filters on top of a NodeIterator or a TreeWalker.
Example 12.5 summarizes the NodeFilter interface. You implement this interface ...
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