sys-file-reader: Accept measurement value of zero without complaint.

[pspp] / doc / dev / system-file-format.texi

diff --git a/doc/dev/system-file-format.texi b/doc/dev/system-file-format.texi
index e98b718883e1ef7507e48c4f39fdc0d19fd9198f..af74fd2f600c6e95f0380afa23465605365263b8 100644 (file)
--- a/doc/dev/system-file-format.texi
+++ b/doc/dev/system-file-format.texi
@@ -831,8 +831,8 @@ Ordinal Scale
 Continuous Scale
 @end table
 
-SPSS 14 sometimes writes a @code{measure} of 0 for string variables.
-PSPP interprets this as nominal scale.
+SPSS sometimes writes a @code{measure} of 0.  PSPP interprets this as
+nominal scale.
 
 @item int32 width;
 The width of the display column for the variable in characters.
@@ -1253,7 +1253,9 @@ Record type.  Always set to 7.
 @item int32 subtype;
 Record subtype.  May take any value.  According to Aapi
 H@"am@"al@"ainen, value 5 indicates a set of grouped variables and 6
-indicates date info (probably related to USE).
+indicates date info (probably related to USE).  Subtype 24 appears to
+contain XML that describes how data in the file should be displayed
+on-screen.
 
 @item int32 size;
 Size of each piece of data in the data part.  Should have the value 1,