+
+@item 31
+@itemx 58
+(These bytes begin a @code{value-mod}.) A format string, analogous to
+@code{printf}, followed by one or more arguments, each of which has
+one or more values. The format string uses the following syntax:
+
+@table @code
+@item \%
+@item \:
+@item \[
+@item \]
+Each of these expands to the character following @samp{\\}. This is
+useful to escape characters that have special meaning in format
+strings. These are effective inside and outside the @code{[@dots{}]}
+syntax forms described below.
+
+@item \n
+Expands to a new-line, inside or outside the @code{[@dots{}]} forms
+described below.
+
+@item ^@var{i}
+Expands to a formatted version of argument @var{i}, which must have
+only a single value. For example, @code{^1} would expand to the first
+argument's @code{value}.
+
+@item [:@var{a}:]@var{i}
+Expands @var{a} for each of the @code{value}s in @var{i}. @var{a}
+should contain one or more @code{^@var{j}} conversions, which are
+drawn from the values for argument @var{i} in order. Some examples
+from the corpus:
+
+@table @code
+@item [:^1:]1
+All of the values for the first argument, concatenated.
+
+@item [:^1\n:]1
+Expands to the values for the first argument, each followed by
+a new-line.
+
+@item [:^1 = ^2:]2
+Expands to @code{@var{x} = @var{y}} where @var{x} is the second
+argument's first value and @var{y} is its second value. (This would
+be used only if the argument has two values. With additional values,
+the second and third values would be directly concatenated, which
+would look funny.)
+@end table
+
+@item [@var{a}:@var{b}:]@var{i}
+This extends the previous form so that the first values are expanded
+using @var{a} and later values are expanded using @var{b}. For an
+unknown reason, within @var{a} the @code{^@var{j}} conversions are
+instead written as @code{%@var{j}}. Some examples from the corpus:
+
+@table @code
+@item [%1:*^1:]1
+Expands to all of the values for the first argument, separated by
+@samp{*}.
+
+@item [%1 = %2:, ^1 = ^2:]1
+Given appropriate values for the first argument, expands to @code{X =
+1, Y = 2, Z = 3}.
+
+@item [%1:, ^1:]1
+Given appropriate values, expands to @code{1, 2, 3}.
+@end table
+@end table
+
+The format string is localized to the user's locale.
+@end table
+
+@example
+value-mod :=
+ 31 i0 (i0 | i1 string[subscript]) value-mod-i0-v1 /* @r{version 1} */
+ | 31 i0 (i0 | i1 string[subscript]) value-mod-i0-v3 /* @r{version 3} */
+ | 31 i1 int32[footnote-number] format
+ | 31 i2 (00 | 01 | 02) 00 (i1 | i2 | i3) format
+ | 31 i3 00 00 01 00 i2 format
+ | 58
+value-mod-i0-v1 := 00 (i1 | i2) 00 00 int32 00 00
+value-mod-i0-v3 := count(format-string
+ (58 | 31 style)
+ (58
+ | 31 i0 i0 i0 i0 01 00 (01 | 02 | 08)
+ 00 08 00 0a 00))
+
+style := 01? 00? 00? 00? 01 string[fgcolor] string[bgcolor] string[font] byte
+format := 00 00 count(format-string (58 | 31 style) 58)
+format-string := count((i0 (58 | 31 string))?)
+@end example
+
+A @code{value-mod} can specify special modifications to a @code{value}:
+
+@itemize @bullet
+@item
+The @code{footnote-number}, if present, specifies a footnote that the
+@code{value} references. The footnote's marker is shown appended to
+the main text of the @code{value}, as a superscript.
+
+@item
+The @code{subscript}, if present, specifies a string to append to the
+main text of the @code{value}, as a subscript. The subscript text is
+normally a brief indicator, e.g.@: @samp{a} or @samp{a,b}, with its
+meaning indicated by the table caption. In this usage, subscripts are
+similar to footnotes; one apparent difference is that a @code{value}
+can only reference one footnote but a subscript can list more than one
+letter.
+
+@item
+The @code{format}, if present, is a format string for substitutions
+using the syntax explained previously. It appears to be an
+English-language version of the localized format string in the
+@code{value} in which the @code{format} is nested.
+
+@item
+The @code{style}, if present, changes the style for this individual
+@code{value}.
projects / pspp / blobdiff