1 XMLGROUP ( 2+ , 2 expression 2.1? AS qname-identifier 3? 3 ORDER BY 3.1+ , 3.1 sort-key-expression 3.1.1! ASC 3.1.1? 3.1.1 DESC 4? OPTION 4.1+ 4.1.0! ROW "row" 4.1.0! ROW row-name 4.1! ROOT "rowset" 4.1! ROOT root-name 4.1 AS ATTRIBUTES 4.2 4.3 )