===================================================================
RCS file: /cvs/mandoc/mandoc_char.7,v
retrieving revision 1.38
retrieving revision 1.49
diff -u -p -r1.38 -r1.49
--- mandoc/mandoc_char.7	2010/05/09 21:11:22	1.38
+++ mandoc/mandoc_char.7	2011/08/30 13:14:01	1.49
@@ -1,4 +1,4 @@
-.\"	$Id: mandoc_char.7,v 1.38 2010/05/09 21:11:22 kristaps Exp $
+.\"	$Id: mandoc_char.7,v 1.49 2011/08/30 13:14:01 kristaps Exp $
 .\"
 .\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"
@@ -14,7 +14,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: May 9 2010 $
+.Dd $Mdocdate: August 30 2011 $
 .Dt MANDOC_CHAR 7
 .Os
 .Sh NAME
@@ -74,7 +74,7 @@ It's guaranteed that each input symbol will correspond
 These are the preferred input symbols for producing special characters.
 .Pp
 Spacing:
-.Bl -column -compact -offset indent "Input" "Description"
+.Bl -column "Input" "Description" -offset indent -compact
 .It Em Input Ta Em Description
 .It \e~      Ta non-breaking, non-collapsing space
 .It \e       Ta breaking, non-collapsing n-width space
@@ -87,7 +87,7 @@ Spacing:
 .El
 .Pp
 Lines:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(ba    Ta \(ba        Ta bar
 .It \e(br    Ta \(br        Ta box rule
@@ -99,7 +99,7 @@ Lines:
 .El
 .Pp
 Text markers:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(ci    Ta \(ci        Ta circle
 .It \e(bu    Ta \(bu        Ta bullet
@@ -118,7 +118,7 @@ Text markers:
 .El
 .Pp
 Legal symbols:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(co    Ta \(co        Ta copyright
 .It \e(rg    Ta \(rg        Ta registered
@@ -126,7 +126,7 @@ Legal symbols:
 .El
 .Pp
 Punctuation:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(em    Ta \(em        Ta em-dash
 .It \e(en    Ta \(en        Ta en-dash
@@ -138,7 +138,7 @@ Punctuation:
 .El
 .Pp
 Quotes:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(Bq    Ta \(Bq        Ta right low double-quote
 .It \e(bq    Ta \(bq        Ta right low single-quote
@@ -155,7 +155,7 @@ Quotes:
 .El
 .Pp
 Brackets:
-.Bl -column -compact -offset indent "xxbracketrightbpx" Rendered Description
+.Bl -column "xxbracketrightbpx" Rendered Description -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(lB    Ta \(lB        Ta left bracket
 .It \e(rB    Ta \(rB        Ta right bracket
@@ -194,7 +194,7 @@ Brackets:
 .El
 .Pp
 Arrows:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(<-    Ta \(<-        Ta left arrow
 .It \e(->    Ta \(->        Ta right arrow
@@ -211,7 +211,7 @@ Arrows:
 .El
 .Pp
 Logical:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(AN    Ta \(AN        Ta logical and
 .It \e(OR    Ta \(OR        Ta logical or
@@ -226,7 +226,7 @@ Logical:
 .El
 .Pp
 Mathematical:
-.Bl -column -compact -offset indent "xxcoproductxx" "Rendered" "Description"
+.Bl -column "xxcoproductxx" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(pl    Ta \(pl        Ta plus
 .It \e(mi    Ta \(mi        Ta minus
@@ -288,10 +288,13 @@ Mathematical:
 .It \e(Re    Ta \(Re        Ta real
 .It \e(pd    Ta \(pd        Ta partial differential
 .It \e(-h    Ta \(-h        Ta Planck constant over 2\(*p
+.It \e[12]   Ta \[12]       Ta one-half
+.It \e[14]   Ta \[14]       Ta one-fourth
+.It \e[34]   Ta \[34]       Ta three-fourths
 .El
 .Pp
 Ligatures:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(ff    Ta \(ff        Ta ff ligature
 .It \e(fi    Ta \(fi        Ta fi ligature
@@ -308,7 +311,7 @@ Ligatures:
 .El
 .Pp
 Accents:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(a"    Ta \(a"        Ta Hungarian umlaut
 .It \e(a-    Ta \(a-        Ta macron
@@ -330,7 +333,7 @@ Accents:
 .El
 .Pp
 Accented letters:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e('A    Ta \('A        Ta acute A
 .It \e('E    Ta \('E        Ta acute E
@@ -390,7 +393,7 @@ Accented letters:
 .El
 .Pp
 Special letters:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(-D    Ta \(-D        Ta Eth
 .It \e(Sd    Ta \(Sd        Ta eth
@@ -401,7 +404,7 @@ Special letters:
 .El
 .Pp
 Currency:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(Do    Ta \(Do        Ta dollar
 .It \e(ct    Ta \(ct        Ta cent
@@ -414,7 +417,7 @@ Currency:
 .El
 .Pp
 Units:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(de    Ta \(de        Ta degree
 .It \e(%0    Ta \(%0        Ta per-thousand
@@ -424,7 +427,7 @@ Units:
 .El
 .Pp
 Greek letters:
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+.Bl -column "Input" "Rendered" "Description" -offset indent -compact
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e(*A    Ta \(*A        Ta Alpha
 .It \e(*B    Ta \(*B        Ta Beta
@@ -481,10 +484,14 @@ Greek letters:
 .It \e(ts    Ta \(ts        Ta sigma terminal
 .El
 .Sh PREDEFINED STRINGS
-These are not recommended for use, as they differ across
-implementations:
-.Pp
-.Bl -column -compact -offset indent "Input" "Rendered" "Description"
+Predefined strings are inherited from the macro packages of historical
+troff implementations.
+They are
+.Em not recommended
+for use, as they differ across implementations.
+Manuals using these predefined strings are almost certainly not
+portable.
+.Bl -column "Input" "Rendered" "Description" -offset indent
 .It Em Input Ta Em Rendered Ta Em Description
 .It \e*(Ba   Ta \*(Ba       Ta vertical bar
 .It \e*(Ne   Ta \*(Ne       Ta not equal
@@ -512,45 +519,87 @@ implementations:
 .It \e*(>=   Ta \*(>=       Ta greater-than-equal
 .It \e*(aa   Ta \*(aa       Ta acute
 .It \e*(ga   Ta \*(ga       Ta grave
+.It \e*(Px   Ta \*(Px       Ta POSIX standard name
+.It \e*(Ai   Ta \*(Ai       Ta ANSI standard name
 .El
-.Sh COMPATIBILITY
-This section documents compatibility of
-.Nm
-with older or existing versions of
-.Xr groff 1 .
+.Sh UNICODE CHARACTERS
+The escape sequence
 .Pp
-The following render differently in
-.Fl T Ns Ar ascii
-output mode:
-.Bd -ragged -offset indent
-\e(ss, \e(nm, \e(nb, \e(nc, \e(ib, \e(ip, \e(pp, \e[sum], \e[product],
-\e[coproduct], \e(gr, \e(-h, \e(a.
-.Ed
+.Dl \e[uXXXX]
 .Pp
-The following render differently in
-.Fl T Ns Ar html
-output mode:
-.Bd -ragged -offset indent
-\e(~=, \e(nb, \e(nc
-.Ed
+is interpreted as a Unicode codepoint.
+The codepoint must be in the range above U+0080 and less than U+10FFFF.
+For compatibility, points must be zero-padded to four characters; if
+greater than four characters, no zero padding is allowed.
+Unicode surrogates are not allowed.
+.\" .Pp
+.\" Unicode glyphs attenuate to the
+.\" .Sq \&?
+.\" character if invalid or not rendered by current output media.
+.Sh NUMBERED CHARACTERS
+For backward compatibility with existing manuals,
+.Xr mandoc 1
+also supports the
 .Pp
-Finally, the following have been omitted by being poorly documented or
-having no known representation:
-.Bd -ragged -offset indent
-\e[radicalex], \e[sqrtex], \e(ru
-.Ed
+.Dl \eN\(aq Ns Ar number Ns \(aq
+.Pp
+escape sequence, inserting the character
+.Ar number
+from the current character set into the output.
+Of course, this is inherently non-portable and is already marked
+as deprecated in the Heirloom roff manual.
+For example, do not use \eN'34', use \e(dq, or even the plain
+.Sq \(dq
+character where possible.
+.Sh COMPATIBILITY
+This section documents compatibility between mandoc and other other
+troff implementations, at this time limited to GNU troff
+.Pq Qq groff .
+.Pp
+.Bl -dash -compact
+.It
+The \eN\(aq\(aq escape sequence is limited to printable characters; in
+groff, it accepts arbitrary character numbers.
+.It
+In
+.Fl T Ns Cm ascii ,
+the
+\e(ss, \e(nm, \e(nb, \e(nc, \e(ib, \e(ip, \e(pp, \e[sum], \e[product],
+\e[coproduct], \e(gr, \e(\-h, and \e(a. special characters render
+differently between mandoc and groff.
+.It
+In
+.Fl T Ns Cm html
+and
+.Fl T Ns Cm xhtml ,
+the \e(~=, \e(nb, and \e(nc special characters render differently
+between mandoc and groff.
+.It
+The
+.Fl T Ns Cm ps
+and
+.Fl T Ns Cm pdf
+modes format like
+.Fl T Ns Cm ascii
+instead of rendering glyphs as in groff.
+.It
+The \e[radicalex], \e[sqrtex], and \e(ru special characters have been omitted
+from mandoc either because they are poorly documented or they have no
+known representation.
+.El
 .Sh SEE ALSO
 .Xr mandoc 1
 .Sh AUTHORS
 The
 .Nm
 manual page was written by
-.An Kristaps Dzonsons Aq kristaps@bsd.lv .
+.An Kristaps Dzonsons ,
+.Mt kristaps@bsd.lv .
 .Sh CAVEATS
 The
 .Sq \e*(Ba
 escape mimics the behaviour of the
-.Sq \*(Ba
+.Sq \&|
 character in
 .Xr mdoc 7 ;
 thus, if you wish to render a vertical bar with no side effects, use