>>>>> "J" == J S Rawat <jrawat@xxxxxxxxxxxxxx> writes:

    J> Hi, Anyone who can help me. I want to merge <a1> within <a> if
    J> it is immediate following it. "following::a1[1]" is not working
    J> properly.

It probably is.
I guess you are confusing following with child.

Post your transformation if this guess isn't enlightening.
-- 
Colin Adams
Preston Lancashire