testing for following siblings

Another confusion ... I'm trying to determine when the current node has no following siblings.  One expression that seems to work is:

    not(following-sibling::*)

but the following expressions don't "work", and I thought they would

    following-sibling::* = ''
    following-sibling::* = '/..'

Any help on where I've gone wrong (this time) is appreciated.

Thanks,

Paul


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