A value known at compile time to have string type is represented as an
char. String values do not necessarily represent
readable text strings and may contain arbitrary 8-bit data, including
null bytes, control codes, and bytes with the high bit set. Thus,
string values are not null-terminated strings, but rather opaque
arrays of bytes.
HIGHEST have no equivalents
as string values. Usually, PSPP fills an unknown or undefined string
values with spaces, but PSPP does not treat such a string as a special
case when it processes it later.
MAX_STRING, the maximum length of a string value, is defined in