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In the current XQUF 3.0 spec, thre is a new rule for invoking updating functions: [207] UpdatingFunctionCall ::= "invoke" "updating" PrimaryExpr "(" (ExprSingle ("," ExprSingle)*)? ")" However, this rule is currently not referenced by any other rule in the grammar.
It is referenced by ExprSingle: http://www.w3.org/TR/xquery-update-30/#doc-xquery30-ExprSingle
So true. Sorry for taking your time.