X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=doc%2Fdev%2Fsystem-file-format.texi;h=9bb636144030ea83c595a2ebd48a099192a61003;hb=d7ab350db46e9e410119723b14a6f2783279bd2a;hp=af74fd2f600c6e95f0380afa23465605365263b8;hpb=f1e84802839683eba11166a85e2f9fb5d49f3490;p=pspp

diff --git a/doc/dev/system-file-format.texi b/doc/dev/system-file-format.texi
index af74fd2f60..9bb6361440 100644
--- a/doc/dev/system-file-format.texi
+++ b/doc/dev/system-file-format.texi
@@ -1189,6 +1189,32 @@ will contain a variable attribute record with the following contents:
 00000030  0a 29                                             |.)              |
 @end example
 
+@menu
+* Variable Roles::
+@end menu
+
+@node Variable Roles
+@subsection Variable Roles
+
+A variable's role is represented as an attribute named @code{$@@Role}.
+This attribute has a single element whose values and their meanings
+are:
+
+@table @code
+@item 0
+Input.  This, the default, is the most common role.
+@item 1
+Output.
+@item 2
+Both.
+@item 3
+None.
+@item 4
+Partition.
+@item 5
+Split.
+@end table
+
 @node Extended Number of Cases Record
 @section Extended Number of Cases Record