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3.4.2 Combining Node Sequences "In addition to the sequence operators described here, [XQuery and XPath Functions and Operators 3.1] includes functions for indexed access to items or sub-sequences of a sequence, for indexed insertion or removal of items in a sequence, and for removing duplicate items from a sequence." Not sure what to suggest. Searches on "indexed access," "indexed insertion," "duplicate items," and "removal of items" all return no matches. Perhaps using the terminology of [XQuery and XPath Functions and Operators 3.1]?
I'm changing this to: In addition to the sequence operators described here, <phrase diff="add" at="bug28308">see <xspecref spec="FO31" ref="sequence-functions"/> for functions defined on sequences.</phrase>