[xsl] Duplicates in a sequence ?

["Leo Studer leo.studer@xxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Hello

I have a sequence and want to know whether there are duplicate values in it.

I came out with the following and think there must be an easy solution. Any
suggestion?

let $sequence :=(1,12,14,17,22,12) return (count(distinct-values($sequence))
ne count($sequence))


Thanks in advance
Leo