@end multitable
@end quotation
+A few system files have been observed in the wild with invalid
+@code{write} fields, in particular with value 0. Readers should
+probably treat invalid @code{print} or @code{write} fields as some
+default format.
+
@node Value Labels Records
@section Value Labels Records
@itemize @bullet
@item
-The set's name (an identifier that begins with @samp{$}).
+The set's name (an identifier that begins with @samp{$}), in mixed
+upper and lower case.
@item
An equals sign (@samp{=}).
A space.
@item
-The names of the variables in the set, each separated from the
-previous by a single space.
+The short names of the variables in the set, converted to lowercase,
+each separated from the previous by a single space.
@item
A line feed (byte 0x0a).
The total number of bytes in @code{encoding}.
@item char encoding[];
-The name of the character encoding. Normally this will be an official IANA characterset name or alias.
+The name of the character encoding. Normally this will be an official
+IANA character set name or alias.
See @url{http://www.iana.org/assignments/character-sets}.
+Character set names are not case-sensitive, but SPSS appears to write
+them in all-uppercase.
@end table
This record is not present in files generated by older software. See
In record type 18, this field contains a sequence of one or more
variable attribute sets. If more than one variable attribute set is
present, each one after the first is delimited from the previous by
-@code{/}. Each variable attribute set consists of a (potentially
-long) variable name,
+@code{/}. Each variable attribute set consists of a long
+variable name,
followed by @code{:}, followed by an attribute set with the same
syntax as on record type 17.