获取XQuery [modify()]:修改xml时不支持顶级属性节点出错

DECLARE @mycur CURSOR
DECLARE @id int
DECLARE @ParentNodeName varchar(max)
DECLARE @NodeName varchar(max)
DECLARE @NodeText varchar(max)

SET @mycur = CURSOR
FOR
SELECT * FROM @temp

OPEN @mycur

FETCH NEXT FROM @mycur INTO @id,@ParentNodeName,@NodeName,@NodeText

WHILE @@FETCH_STATUS = 0
BEGIN
PRINT @id -- sample statements
PRINT  @ParentNodeName
PRINT  @NodeName
        SET @x.modify
        ('
            insert attribute status {sql:variable("@status")}
            as first
            into (/@ParentNodeName/@NodeName/child::*[position()=sql:variable("@status")])[1] 
        ')
FETCH NEXT FROM @mycur INTO  @id,@ParentNodeName,@NodeName,@NodeText
END

DEALLOCATE @mycur
DECLARE @mycur CURSOR
DECLARE @id int
DECLARE @