+@c PSPP - a program for statistical analysis.
+@c Copyright (C) 2017 Free Software Foundation, Inc.
+@c Permission is granted to copy, distribute and/or modify this document
+@c under the terms of the GNU Free Documentation License, Version 1.3
+@c or any later version published by the Free Software Foundation;
+@c with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
+@c A copy of the license is included in the section entitled "GNU
+@c Free Documentation License".
+@c
@node System and Portable File IO
@chapter System and Portable File I/O
numeric user-missing values like system-missing values and string
user-missing values as all spaces.
-By default, all the variables in the active dataset dictionary are saved
-to the system file, but @subcmd{DROP} or @subcmd{KEEP} can select a subset of variable
-to save. The @subcmd{RENAME} subcommand can also be used to change the names
-under which variables are saved. @subcmd{UNSELECTED} determines whether cases
-filtered out by the @cmd{FILTER} command are written to the output file.
-These subcommands have the same syntax and meaning as on the
-@cmd{SAVE} command (@pxref{SAVE}).
+By default, all the variables in the active dataset dictionary are
+saved to the system file, but @subcmd{DROP} or @subcmd{KEEP} can
+select a subset of variable to save. The @subcmd{RENAME} subcommand
+can also be used to change the names under which variables are saved;
+because they are used only in the output, these names do not have to
+conform to the usual PSPP variable naming rules. @subcmd{UNSELECTED}
+determines whether cases filtered out by the @cmd{FILTER} command are
+written to the output file. These subcommands have the same syntax
+and meaning as on the @cmd{SAVE} command (@pxref{SAVE}).
Each supported file type has additional subcommands, explained in
separate sections below.
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