include only attributes of a record which are not null

Greetings from stackoverflow,

I'm presently developing a system for exporting data from databases. Every record has over 30 properties, and I only want to export the ones that are really worth anything.

Here is an illustration in case the information is not clear enough:

+----+-----------+------------+---------+--------+
| ID | Name      | Profession | Country | Salary |
+----+-----------+------------+---------+--------+
| 1  | John Doe  | NULL       | USA     | 5000   |
+----+-----------+------------+---------+--------+
| 2  | Jane Doe  | Painter    | NULL    | NULL   |
+----+-----------+------------+---------+--------+
| 3  | Jonas Doe | Butcher    | England | 8000   |
+----+-----------+------------+---------+--------+

Expected outputs:
John Doe: John Doe, USA, 5000
Jane Doe: Jane Doe, Painter
Jonas Doe: Jonas Doe, Butcher, England, 8000

An XML file should be created from these outputs.

If feasible, this ought to be possible for every database record. I was seeking for a function that would determine whether or not to add an attribute to the export file based on whether or not it contains a value. Sadly, I was unable to locate anything similar.

Edit: Up till now, all I've done is write a query to retrieve every available attribute:

CREATE PROCEDURE export @id int AS
BEGIN
SELECT Name,Profession,Country,Salary FROM Employee
WHERE ID = @id;
END
GO