LISTCOLUMN identifies a column in a table and is defined as follows:
type LISTCOLUMN is INTEGER, STRING
The interpretation of a value of type LISTCOLUMN depends on whether the type is an integer or a string.
An integer value specifies the 1-based index of the column.
A string value specifies the name of the column. The string can contain wildcard characters. (You can also specify the index of the column as a string, in the form "#n" where n is the numerical index of the column.)