如何在SQL Server 2005中选择xml列的顶级属性？

CREATE TABLE Tbl(Id INT PRIMARY KEY, XmlData XML);

INSERT INTO Tbl(Id, XmlData)
VALUES(1, '<Root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <Child1>content1</Child1>
 <Child2>content2</Child2>
 <Child3>content3</Child3>
</Root>');

DECLARE @Doc INT
EXEC sp_xml_preparedocument @Doc OUTPUT, @XmlData

SELECT *
FROM OPENXML(@Doc, '/Root')
      WITH (Child1 VARCHAR(50) 'Child1',
            Child2 VARCHAR(50) 'Child2',
            Child3 VARCHAR(50) 'Child3')

EXEC sp_xml_removedocument @Doc

Child1    Child2    Child3
------------------------------
content1  content2  content3