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The advantage of separating the data from the structure is that a variety of different structure XSL stylesheets can be written to provide for a variety of different viewing framework options. Separate structure stylesheets can be written that will create a framework for the layout to be viewed as channels within columns under and list of tabs. It may instead use a vertical tree next to the columns and channels. Any framework that someone may come up with for the layout node tree can be developed by writing an XSL stylesheet to represent it.
Different interpretations of a tab/column or tree/column, as well as some other, completely unrelated structures are all possible results of applying the layout XML to an XSL stylesheet. Below is an excerpt of a "tab/column" structure XML.
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