On Fri, 2011-10-28 at 10:27 -0400, Murray McDonald wrote:

If you are sure that there will be one and only one "match" then the '[1]'
is unnecessary

index-of(//book, //book[ends-with(., 'ASTRO_00007.JPG')])[1]

On the other hand, the difference between /a/b/c[1] and (/a/b/c)[1] is a
major source of confusion for the newcomer and the "perpetual
intermediate" [1] alike.

Sometimes you have to make the computer work a little harder if it means
getting the right answer more often.