spv-file-format.texi: New file.

diff --git a/spv-file-format.texi b/spv-file-format.texi
new file mode 100644 (file)
index 0000000..5710603
--- /dev/null
+++ b/spv-file-format.texi
@@ -0,0 +1,16 @@
+@section SPSS Viewer Format
+@node SPSS Viewer Format
+
+SPSS Viewer or @file{.spv} files, here called SPV files, are written
+by SPSS 16 and later to represent the contents of its output editor.
+This section documents the format.  This description is detailed
+enough to read SPV files, but it is probably not sufficient to
+write them.
+
+An SPV file is a Zip archive that can be read with @command{zipinfo}
+and @command{unzip} and similar programs.  The final member in the Zip
+archive is a file named @file{META-INF/MANIFEST.MF}.  This structure
+makes SPV files resemble Java ``JAR'' files, but whereas a JAR
+manifest contains a sequence of colon-delimited key/value pairs, an
+SPV manifest contains the string @samp{allowPivoting=true}, without a
+new-line.