===================================================================
RCS file: /cvs/mandoc/mdoc.7,v
retrieving revision 1.197
retrieving revision 1.198
diff -u -p -r1.197 -r1.198
--- mandoc/mdoc.7	2011/08/10 14:07:23	1.197
+++ mandoc/mdoc.7	2011/08/16 23:37:39	1.198
@@ -1,4 +1,4 @@
-.\"	$Id: mdoc.7,v 1.197 2011/08/10 14:07:23 kristaps Exp $
+.\"	$Id: mdoc.7,v 1.198 2011/08/16 23:37:39 schwarze Exp $
 .\"
 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
 .\" Copyright (c) 2010 Ingo Schwarze <schwarze@openbsd.org>
@@ -15,7 +15,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: August 10 2011 $
+.Dd $Mdocdate: August 16 2011 $
 .Dt MDOC 7
 .Os
 .Sh NAME
@@ -471,6 +471,21 @@ Print verbose information.
 .Ed
 .Pp
 Manuals not documenting a command won't include the above fragment.
+.Pp
+Since the
+.Em DESCRIPTION
+section usually contains most of the text of a manual, longer manuals
+often use the
+.Sx \&Ss
+macro to form subsections.
+In very long manuals, the
+.Em DESCRIPTION
+may be split into multiple sections, each started by an
+.Sx \&Sh
+macro followed by a non-standard section name, and each having
+several subsections, like in the present
+.Nm
+manual.
 .It Em IMPLEMENTATION NOTES
 Implementation-specific notes should be kept here.
 This is useful when implementing standard functions that may have side
@@ -532,7 +547,13 @@ This section should exist for most manuals.
 Cross-references should conventionally be ordered first by section, then
 alphabetically.
 .Pp
+References to other documentation concerning the topic of the manual page,
+for example authoritative books or journal articles, may also be
+provided in this section.
+.Pp
 See
+.Sx \&Rs
+and
 .Sx \&Xr .
 .It Em STANDARDS
 References any standards implemented or used.
@@ -543,7 +564,8 @@ section should be used instead.
 See
 .Sx \&St .
 .It Em HISTORY
-A brief history of the subject, including where support first appeared.
+A brief history of the subject, including where it was first implemented,
+and when it was ported to or reimplemented for the operating system at hand.
 .It Em AUTHORS
 Credits to the person or persons who wrote the code and/or documentation.
 Authors should generally be noted by both name and email address.
@@ -1176,20 +1198,27 @@ The
 must be one of the following:
 .Bl -tag -width 13n -offset indent
 .It Fl centered
-Centre-justify each line.
+Produce one output line from each input line, and centre-justify each line.
 Using this display type is not recommended; many
 .Nm
 implementations render it poorly.
 .It Fl filled
-Left- and right-justify the block.
+Change the positions of line breaks to fill each line, and left- and
+right-justify the resulting block.
 .It Fl literal
-Do not justify the block at all.
+Produce one output line from each input line,
+and do not justify the block at all.
 Preserve white space as it appears in the input.
+Always use a constant-width font.
+Use this for displaying source code.
 .It Fl ragged
-Only left-justify the block.
+Change the positions of line breaks to fill each line, and left-justify
+the resulting block.
 .It Fl unfilled
-An alias for
-.Fl literal .
+The same as
+.Fl literal ,
+but using the same font as for normal text, which is a variable width font
+if supported by the output device.
 .El
 .Pp
 The
@@ -1205,7 +1234,7 @@ which may be one of the following:
 .It
 One of the pre-defined strings
 .Cm indent ,
-the width of standard indentation;
+the width of a standard indentation (six constant width characters);
 .Cm indent-two ,
 twice
 .Cm indent ;
@@ -1382,9 +1411,12 @@ except that dashes are used in place of bullets.
 Like
 .Fl inset ,
 except that item heads are not parsed for macro invocations.
-.\" but with additional formatting to the head.
+Most often used in the
+.Em DIAGNOSTICS
+section with error constants in the item heads.
 .It Fl enum
 A numbered list.
+No item heads can be specified.
 Formatted like
 .Fl bullet ,
 except that cardinal numbers are used in place of bullets,
@@ -1424,6 +1456,13 @@ this head on the same output line.
 Otherwise, the body starts on the output line following the head.
 .El
 .Pp
+Lists may be nested within lists and displays.
+Nesting of
+.Fl column
+and
+.Fl enum
+lists may not be portable.
+.Pp
 See also
 .Sx \&El
 and
@@ -1500,12 +1539,13 @@ and
 .Sx \&Ux .
 .Ss \&Bt
 Prints
-.Dq is currently in beta test .
+.Dq is currently in beta test.
 .Ss \&Bx
 Format the BSD version provided as an argument, or a default value if no
 argument is provided.
 .Pp
 Examples:
+.Dl \&.Bx 4.3 Tahoe
 .Dl \&.Bx 4.4
 .Dl \&.Bx
 .Pp
@@ -1865,9 +1905,12 @@ See also
 and
 .Sx \&It .
 .Ss \&Em
-Denotes text that should be emphasised.
+Denotes text that should be
+.Em emphasised .
 Note that this is a presentation term and should not be used for
 stylistically decorating technical terms.
+Depending on the output device, this is usually represented
+using an italic font or underlined characters.
 .Pp
 Examples:
 .Dl \&.Em Warnings!
@@ -1875,9 +1918,10 @@ Examples:
 .Pp
 See also
 .Sx \&Bf ,
-.Sx \&Sy ,
+.Sx \&Li ,
+.Sx \&No ,
 and
-.Sx \&Li .
+.Sx \&Sy .
 .Ss \&En
 This macro is obsolete and not implemented in
 .Xr mandoc 1 .
@@ -1994,7 +2038,7 @@ output.
 Examples:
 .Dl ".Nm cat Fl v No considered harmful"
 .Dl ".Nm cp Fl pR Ar source ... directory"
-.Dl ".Nm find Ar dir Fl type Cm d Fl name Pa CVS
+.Dl ".Nm find Ar dir Fl type Cm d Fl name Pa CVS"
 .Dl ".Nm kill Fl Ar signal_number pid"
 .Dl ".Nm su Fl"
 .Pp
@@ -2069,7 +2113,13 @@ See also
 and
 .Sx \&Ft .
 .Ss \&Fr
-This macro is obsolete and not implemented.
+This macro is obsolete and not implemented in
+.Xr mandoc 1 .
+.Pp
+It was used to show function return values.
+The syntax was:
+.Pp
+.Dl Pf . Sx \&Fr Ar value
 .Ss \&Ft
 A function type.
 Its syntax is as follows:
@@ -2112,7 +2162,13 @@ See also
 and
 .Sx \&Ux .
 .Ss \&Hf
-This macro is obsolete and not implemented.
+This macro is not implemented in
+.Xr mandoc 1 .
+.Pp
+It was used to include the contents of a (header) file literally.
+The syntax was:
+.Pp
+.Dl Pf . Sx \&Hf Ar filename
 .Ss \&Ic
 Designate an internal or interactive command.
 This is similar to
@@ -2251,15 +2307,21 @@ Examples:
 .Dl \&.Lb libz
 .Dl \&.Lb mdoc
 .Ss \&Li
-Denotes text that should be in a literal font mode.
+Denotes text that should be in a
+.Li literal
+font mode.
 Note that this is a presentation term and should not be used for
 stylistically decorating technical terms.
 .Pp
+On terminal output devices, this is often indistinguishable from
+normal text.
+.Pp
 See also
 .Sx \&Bf ,
-.Sx \&Sy ,
+.Sx \&Em ,
+.Sx \&No ,
 and
-.Sx \&Em .
+.Sx \&Sy .
 .Ss \&Lk
 Format a hyperlink.
 Its syntax is as follows:
@@ -2303,8 +2365,8 @@ section subsequent the
 macro.
 .Pp
 Examples:
-.Dl \&.Sx \&Nd mdoc language reference
-.Dl \&.Sx \&Nd format and display UNIX manuals
+.Dl Pf . Sx \&Nd mdoc language reference
+.Dl Pf . Sx \&Nd format and display UNIX manuals
 .Pp
 The
 .Sx \&Nd
@@ -2356,21 +2418,44 @@ macro rather than
 .Sx \&Nm
 to mark up the name of the manual page.
 .Ss \&No
-A
-.Dq noop
-macro used to terminate prior macro contexts.
+Normal text.
+Closes the scope of any preceding in-line macro.
+When used after physical formatting macros like
+.Sx \&Em
+or
+.Sx \&Sy ,
+switches back to the standard font face and weight.
+Can also be used to embed plain text strings in macro lines
+using semantic annotation macros.
 .Pp
 Examples:
-.Dl \&.Sx \&Fl ab \&No cd \&Fl ef
+.Dl ".Em italic , Sy bold , No and roman"
+.Pp
+.Bd -literal -offset indent -compact
+\&.Sm off
+\&.Cm :C No / Ar pattern No / Ar replacement No /
+\&.Sm on
+.Ed
+.Pp
+See also
+.Sx \&Em ,
+.Sx \&Li ,
+and
+.Sx \&Sy .
 .Ss \&Ns
-Suppress a space.
-Following invocation, text is interpreted as free-form text until a
-macro is encountered.
+Suppress a space between the output of the preceding macro
+and the following text or macro.
+Following invocation, input is interpreted as normal text
+just like after an
+.Sx \&No
+macro.
 .Pp
 This has no effect when invoked at the start of a macro line.
 .Pp
 Examples:
-.Dl \&.Fl o \&Ns \&Ar output
+.Dl ".Ar name Ns = Ns Ar value"
+.Dl ".Cm :M Ns Ar pattern"
+.Dl ".Fl o Ns Ar output"
 .Pp
 See also
 .Sx \&No
@@ -2448,10 +2533,13 @@ See also
 and
 .Sx \&Dt .
 .Ss \&Ot
-Unknown usage.
+This macro is obsolete and not implemented in
+.Xr mandoc 1 .
 .Pp
-.Em Remarks :
-this macro has been deprecated.
+Historical
+.Xr mdoc 7
+packages described it as
+.Dq "old function type (FORTRAN)" .
 .Ss \&Ox
 Format the
 .Ox
@@ -2487,19 +2575,25 @@ See also
 Close parenthesised context opened by
 .Sx \&Po .
 .Ss \&Pf
-Removes the space
+Removes the space between its argument
 .Pq Dq prefix
-between its arguments.
+and the following macro.
 Its syntax is as follows:
 .Pp
-.D1 Pf \. \&Pf Ar prefix suffix
+.D1 .Pf Ar prefix macro arguments ...
 .Pp
-The
-.Ar suffix
-argument may be a macro.
+This is equivalent to:
 .Pp
+.D1 .No Ar prefix No \&Ns Ar macro arguments ...
+.Pp
 Examples:
-.Dl \&.Pf \e. \&Sx \&Pf \&Ar prefix suffix
+.Dl ".Pf $ Ar variable_name"
+.Dl ".Pf 0x Ar hex_digits"
+.Pp
+See also
+.Sx \&Ns
+and
+.Sx \&Sm .
 .Ss \&Po
 Multi-line version of
 .Sx \&Pq .
@@ -2507,6 +2601,18 @@ Multi-line version of
 Break a paragraph.
 This will assert vertical space between prior and subsequent macros
 and/or text.
+.Pp
+Paragraph breaks are not needed before or after
+.Sx \&Sh
+or
+.Sx \&Ss
+macros or before displays
+.Pq Sx \&Bd
+or lists
+.Pq Sx \&Bl
+unless the
+.Fl compact
+flag is given.
 .Ss \&Pq
 Parenthesised enclosure.
 .Pp
@@ -2526,7 +2632,7 @@ Multi-line version of
 .Sx \&Qq .
 .Ss \&Qq
 Encloses its arguments in
-.Dq typewriter
+.Qq typewriter
 double-quotes.
 Consider using
 .Sx \&Dq .
@@ -2640,7 +2746,7 @@ Multi-line version of
 .Sx \&Sq .
 .Ss \&Sq
 Encloses its arguments in
-.Dq typewriter
+.Sq typewriter
 single-quotes.
 .Pp
 See also
@@ -2649,13 +2755,15 @@ See also
 and
 .Sx \&So .
 .Ss \&Ss
-Begin a new sub-section.
+Begin a new subsection.
 Unlike with
 .Sx \&Sh ,
-there's no convention for sub-sections.
-Conventional sections, as described in
-.Sx MANUAL STRUCTURE ,
-rarely have sub-sections.
+there is no convention for the naming of subsections.
+Except
+.Em DESCRIPTION ,
+the conventional sections described in
+.Sx MANUAL STRUCTURE
+rarely have subsections.
 .Pp
 Sub-section names should be unique so that they may be keyed by
 .Sx \&Sx .
@@ -2767,8 +2875,8 @@ The following standards are recognised:
 .St -svid4
 .El
 .Ss \&Sx
-Reference a section or sub-section.
-The referenced section or sub-section name must be identical to the
+Reference a section or subsection in the same manual page.
+The referenced section or subsection name must be identical to the
 enclosed argument, including whitespace.
 .Pp
 Examples:
@@ -2786,9 +2894,10 @@ stylistically decorating technical terms.
 .Pp
 See also
 .Sx \&Bf ,
+.Sx \&Em ,
 .Sx \&Li ,
 and
-.Sx \&Em .
+.Sx \&No .
 .Ss \&Ta
 Table cell separator in
 .Sx \&Bl Fl column
@@ -2797,11 +2906,16 @@ lists; can only be used below
 .Ss \&Tn
 Format a tradename.
 .Pp
+Since this macro is often implemented to use a small caps font,
+it has historically been used for acronyms (like ASCII) as well.
+Such usage is not recommended because it would use the same macro
+sometimes for semantical annotation, sometimes for physical formatting.
+.Pp
 Examples:
 .Dl \&.Tn IBM
 .Ss \&Ud
 Prints out
-.Dq currently under development .
+.Dq currently under development.
 .Ss \&Ux
 Format the UNIX name.
 Accepts no argument.
@@ -3097,7 +3211,7 @@ This is not supported by mandoc.
 .Xr mandoc 1 ,
 .Xr eqn 7 ,
 .Xr man 7 ,
-.Xr mandoc_char 7
+.Xr mandoc_char 7 ,
 .Xr roff 7 ,
 .Xr tbl 7
 .Sh HISTORY