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Under the definition of Combined Posture (http://www.w3.org/TR/xslt-30/#dt-combined-posture) the term "input posture" is used repeatedly. To me it is unclear what it means, though from the context it seems to be the set of postures of each operand of a choice operand group. Can we define or clarify this term?
For "the postures of the operands in the group" perhaps read "the postures of the operands in the group (here referred to as the input postures)".
I have changed the term from "input posture" to "operand posture", which hopefully is completely self-explanatory, but for avoidance of doubt I have also introduced the term at the point of first use.