The columns
section of the XML document refer to the columsn that will be offered in the Data Export Manager screens. The text of the column name is arbitrary and can be anything, but the <column column="TABLE.FIELD">
portion must refer to a "core" table of powerschool. When in doubt, use column="STUDENTS.ID"
Avoid using DCID of any table in the column parameter as it might render the query disabled in DEM (grayed out). Reason being the DCID of most tables, starting with Students, is a non-editable identifier key even for system admin roles. Having DCID in SQL and in feild access is acceptable.