[Xpath-ng] List constructor syntax

[David Carlisle]

  foo="{validate{$bar}}"

The obvious solution there (over in xpath2 land)is to make validate a
normal function, it is as far as I know the only use of {} in Xpath (as
opposed to query) and just sticks out like a sore thumb.

  let's start using list()

sounds good to me.

David

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