Why does jackrabbit unsupport the count function in XPATH

[Yao Harrison]

Hi List:

     I've got "javax.jcr.query.InvalidQueryException: Unsupported
function: count" when I excute the XPATH statement that include count(
) function invocation.So can anybody tell me why does JackRabbit not
support the "Count( )" function ,and how can I implement it in XPATH ?

Thanks a million !

Harrison
2005-10-24