(This is a common technique of object-oriented systems.) For convenience, this section refers to the parent class instead of listing all of the derived child classes. The derived "child" classes inherit all of the elements of their parent class and add some specific elements of their own. Note: In KML, some classes are derived from a "parent" class. Using Regions, you can supply separate levels of detail for the data, so that fine details are loaded only when the data fills a portion of the screen that is large enough for the details to be visible. Data is loaded and drawn only when it falls within the user's view and occupies a certain portion of the screen. Regions are a powerful new KML feature that allows you to add very large datasets to Google Earth without sacrificing performance. Here are some of the major new elements you'll be introduced to in KML 2.1:
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