Doing Zero Fill with XSLT 2.0

I was scratching my head, trying to find a simple way to do a zero fill padding with XSLT and I could not find it in my Michael Kay XPath 2.0 book. It turns out he put in in the XSLT 2.0 book. I am not sure how the index missed it. Anyway, searching for "Zero Fill XPath" turned up nothing on Google. Here is how it works. Just use the following:

format-number(number(.), '00000').

Here is an example of the input and output:

Input	Output
1	00001
12	00012
123	00123
1234	01234
12345	12345

Hope this helps. - Dan