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Under the definition of Combined Posture (http://www.w3.org/TR/xslt-30/#dt-combined-posture), the fifth term reads: "If one or more of the input postures is crawling and the remainder (if any) are either striding or grounded, then the combined posture is crawling." The ambiguity is with "either". To me, it can mean anyone of those: a) either the remainder are all striding, or the remainder are all grounded (excludes both) b) any of the remainder can be either striding or grounded (includes both) Obviously, for a choice operand group, the rule should be (b), because grounded is not in the way of streamability here.
We discussed this in Prague, without notable success in finding an alternative formulation that was less ambiguous than the current wording (which the WG took to require interpretation (b)). - and each of the remaining input postures is either ... ? - and each of the others ... ? - and none of the others is climbing or free-ranging We left this to the editor's discretion.
I decided to go with "each of the remainder (if any) is either X or Y".