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"SourceExpr is evaluated as though it were an enclosed expression in an element constructor (see Rule 1e in Section 3.7.1.3 ContentXQ). " Lot's of semantics hidden behind this sentence. Please provide clearer impact: SourceNodes get copied, what about impact of copy namespace etc?
This editorial item requests that the update specification replicate material that is normatively presented in the Element Constructor section of the XQuery specification, rather than referencing it by a hyperlink. In the editor's opinion, this would be redundant and would introduce possible inconsistencies. Therefore I have closed this editorial item without action. --Don Chamberlin (for the Query Working Group)