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CREATE TABLE TableA
(
ID INT IDENTITY (1,1),
TestData VARCHAR(120)
);

INSERT TableA Select 'A';
INSERT TableA Select 'B';
INSERT TableA Select 'C';

SELECT
*
FROM
TableA;
ID TestData
1 A
2 B
3 C
ALTER TABLE TableA ADD [Field1] [xml] DEFAULT
CAST(N'<SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" />' AS xml)

ALTER TABLE TableA ADD [Field2] [xml] DEFAULT
CAST(N'<SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" />' AS xml) WITH VALUES

ALTER TABLE TableA ADD [Field3] [xml] NOT NULL DEFAULT
CAST(N'<SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" />' AS xml)

SELECT * from TABLEA
ID TestData Field1 Field2 Field3
1 A null <SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" /> <SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" />
2 B null <SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" /> <SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" />
3 C null <SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" /> <SettingValues xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://someurl.com/schemas.xsd" />