我们如何知道SQL Server 2005中有多少列来自XML变量

我正在将XML类型变量从一个过程传递到另一个过程。

像这样设置XML变量

Declare @XMLDOC XML

set @XMLDOC = (select 60 as RecordDetailID,            
                      '' as ItemText,            
                      '' as ItemNote,            
                      0 as DisplayOrder                        
               FOR XML RAW) 

在某些情况下,我需要将另一个“状态”列发送到下面的另一个过程

  set @XMLDOC = (select  60 as RecordDetailID,            
                         '' as ItemText,            
                         '' as ItemNote,            
                         0 as DisplayOrder,
                         1 as Status  
                 FOR XML RAW) 

如何知道有多少列已发送到XML类型变量?