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We say under non-positional predicates (section 19.8.10 Classifying Patterns): "The exception for nested predicates is to avoid disqualifying patterns such as match="p[@code = $status[last()]]"." But the pattern "p[@code = $status[last()]]" is not a disqualifying pattern, it is allowed and considered a non-positional pattern, and I think we explicitly allow it. Perhaps we meant to say: "The exception for nested predicates is to allow patterns such as match="p[@code = $status[last()]]", which are motionless [since they do not need to retain positional information of the streamed node]." (the added "[since....]" is just a suggestion)
"to avoid disqualifying" was intended to be read as "to ensure that we do not disqualify". I'll find a way of rewording it to avoid the misreading.
Rewritten as The exception for nested predicates is there to ensure that patterns such as <code>match="p[@code = $status[last()]]</code> are not disqualified. Not change-marked. Hope that's OK.
Looks good to me, tx.