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Add a section explaining how our XML features depart from current versions of the SQL standard. Update and clarify the descriptions of some XML functions. Chapman Flack, reviewed by Ryan Lambert Discussion: https://postgr.es/m/5BD1284C.1010305@anastigmatix.net Discussion: https://postgr.es/m/5C81F8C0.6090901@anastigmatix.net Discussion: https://postgr.es/m/CAN-V+g-6JqUQEQZ55Q3toXEN6d5Ez5uvzL4VR+8KtvJKj31taw@mail.gmail.com