Why does a carriage-return character disappear when converting a string to SQL Server XML datatype?

Whenever I parse a string to SQL XML datatype I notice that carriage-returns disappear whenever whitespace and XML carriage returns are mixed. If they are not mixed things work fine. Doe开发者_运维百科s anyone know why this is happening?

See the SQL example code below

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

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In Windows, end of line is CR-LF. In Unix, end of line is CR.

In the first example, you use CR-CR. I guess SQL Server interprets those as Unix style line endings, giving two whitespace.

You second example was typed in Windows, giving CR-LF-CR-LF. This is interpreted as Windows style line endings, giving two whitespace.

Your third example is CR-CR-LF. That's apparently interpreted as Windows style line endings, giving one whitespace and an unmatched CR.

If you change your third example to use CR-LF, or 
, it will displays two whitespace.