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> I'm sure there must be a reason for that. But it seems clear enough
> that in order to handle further predicates acting on a node-set, that
> the order of the nodes as encountered must be preserved.
That's exactly the struggle I had when implementing werken.xpath,
way back when. Using a literal reading of the spec, I opted for
java.util.Set for my NodeSet, and that failed me when it came to
Figured that preserving order, while not explicitly stated, was
at least an implementation requirement.