Streaming: mixing striding and grounded posture
See spec bug 29507.
Saxon isn't able to stream expressions of the form
(/books/book, $extraBooks) / price
It complains that the expression needs sorting into document order. But it is streamable according to the spec, and there is a feasible strategy for evaluating the expression that doesn't involve buffering the streamed nodes (because these will always be in document order).
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