Hibernate version: 3.0

We migrate our application from Hibenrnate 2.1.8 to 3.0 and we have a query with this form...

select A
from ItemA A, elements(A.childrens) B
where A.code = ? and B.reference = ?
order by index(B)

With this hibernate say

unexpected token: elements near line 1, column 70

Then, i read reference documentation and i found

Note that these constructs - size, elements, indices, minindex, maxindex, minelement, maxelement - may only be used in the where clause in Hibernate3.

My question is, how migrate my query ?, with join ?

regards
epsino

select A
from IteamA a join a.children b
where b.reference = ?
and a.code = ?
order by index(b)

and it will run much faster then the "elements" function

Thanks !!!

But, why is much faster ?

regards
epsino