Here is a contrived example of an xml document. In my real world case, the xml is fairly complex with multiple nested levels.

<alphabet>
<a>A</a>
<b>B</b>
<c>C</c> 
... and so on
</alphabet>

Using xslt, I want to transform the document so that only the vowels are printed.

In my real world case, we're using empty template match tags to block the display. But that's too verbose for my liking.