Abstract Elements
The class tree diagram also indicates which elements are abstract elements (shown in dotted boxes). You cannot create an abstract element directly in a KML file. Abstract elements are an efficient way for the underlying Earth browser code to create complex elements that have a number of elements in common. Each abstract element is a substitution group. For example, any element derived from the <Geometry> abstract element can be substituted for any other element derived from <Geometry>. The derived elements have special uses, but their general usage is the same for siblings of the same ancestor in the tree.
Complex Versus Simple Elements
A complex element contains other elements. A simple element contains a string ...
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