This DEFINE statement and its attributes create the column definition num_var. GENERIC= specifies that multiple variables can use
the same column definition. HEADER= specifies that the header for the column
will be the text of the dynamic variable COLHD, whose value will be set by
the data component.
The STYLE= attribute specifies that the style element for this column
definition is cellcontents.
The END statement ends the definition.
define column num_var;
generic=on;
header=colhd;
style=cellcontents;
end;