Blocks of information describing the variables start with a line
START_VARIABLE = name
and end with the line
END_VARIABLE = name
where the value name is the name to be used
for the variable. The variable name is not in quotes. These blocks are required for variable description and
headers are not valid without one describing each variable. Variable entries must appear within the header in the same order as the variable themselves within each data record.
Variable names are case sensitive, and are an exception to the usual rule of case insensitivity.