[xsl] Data sequence

["JS rawat" <jrawat@xxxxxxxxxxxxxx>]

Hi Team,
Is there any quick idea about how to sequence the authors in the output
file.
 
Input
<article>
<author seq="1">author 1</author>
<author seq="3">author 3</author>
<author seq="2">author 2</author>
</article>
 
Desired output
<article>
<au seq="1">author 1</author>
<au seq="2">author 2</author>
<author seq="3">author 3</author>
</article>
 
Thanks in advance
...JSR