为什么在将字符串转换为SQLServerXML数据类型时,回车符会消失?

每当我将一个字符串解析为SQLXML数据类型时,我注意到只要空格和XML回车混合在一起,回车就会消失。如果它们不是混合的,事情就很好了。有人知道为什么会这样吗?

请参见下面的SQL示例代码

DECLARE @var XML

PRINT 'This is a statement with two XML carriage-return characters'
SET @var = CONVERT (XML,'<root>Dear Sir,&#xD;&#xD;I am passing CR</root>',1)
SELECT @var

PRINT 'output is identical to a statement with two whitespace carriage-return characters'
SET @var = CONVERT (XML,'<root>Dear Sir,

I am passing CR</root>',1)
SELECT @var

PRINT 'Why does this statement only display one space? There is an XML carriage-return AND a whitespace carriage-return character.' 

--Make sure there is no space after &#xD; after you've copied and pasted the code 
SET @var = CONVERT (XML,'<root>Dear Sir,&#xD;
I am passing CR</root>',1)
SELECT @var