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Under 19.8.3 Classifying Sequence Constructors (http://www.w3.org/TR/xslt-30/#classifying-sequence-constructors), the first numbered item in the first list, it says: "The contained instructions. The operand usage for these operands is transmission." This seems too vague, as not all contained instructions are an operand here. Instead, only the immediate children are an operand for a sequence constructor. The typo: the line "The operand roles for ..." should probably be "The operand roles and their usages for ..." to bring it in line with the rest of the streamability rules breakdown.
We discussed this in Prague. For "The contained instructions" perhaps read "The immediately contained instructions"? Editorial.
Changed as suggested.