CREATE TABLE XML_dt (a XML)
#prepst#!# INSERT INTO XML_dt values(@a) #!#XML|-|a|-|<NULL>
#prepst#!# INSERT INTO XML_dt values(@a) #!#XML|-|a|-|<contact><name>Contact Name 2</name><phone>YYY-YYY-YYYY</phone></contact>
#prepst#!#exec#!#XML|-|a|-|
INSERT INTO XML_dt values('<contact><name>Contact Name 2</name><phone>YYY-YYY-YYYY</phone></contact>')
INSERT INTO XML_dt values(NULL)
#INSERT INTO XML_dt values('')
INSERT INTO XML_dt values(<contact><name>Contact Name 2</name><phone>YYY-YYY-YYYY</phone>)