===================================================================
RCS file: /cvs/mandoc/mdoc.7,v
retrieving revision 1.105
retrieving revision 1.129
diff -u -p -r1.105 -r1.129
--- mandoc/mdoc.7	2010/05/14 16:02:29	1.105
+++ mandoc/mdoc.7	2010/07/02 13:07:46	1.129
@@ -1,4 +1,4 @@
-.\"	$Id: mdoc.7,v 1.105 2010/05/14 16:02:29 kristaps Exp $
+.\"	$Id: mdoc.7,v 1.129 2010/07/02 13:07:46 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 14 2010 $
+.Dd $Mdocdate: July 2 2010 $
 .Dt MDOC 7
 .Os
 .Sh NAME
@@ -33,7 +33,7 @@ section describes compatibility with other troff \-mdo
 .Pp
 An
 .Nm
-document follows simple rules:  lines beginning with the control
+document follows simple rules: lines beginning with the control
 character
 .Sq \.
 are parsed for macros.  Other lines are interpreted within the scope of
@@ -55,7 +55,7 @@ Text following a
 whether in a macro or free-form text line, is ignored to the end of
 line.  A macro line with only a control character and comment escape,
 .Sq \&.\e" ,
-is also ignored.  Macro lines with only a control charater and optionally
+is also ignored.  Macro lines with only a control character and optionally
 whitespace are stripped from input.
 .Ss Reserved Characters
 Within a macro line, the following characters are reserved:
@@ -122,7 +122,7 @@ escape followed by an indicator: B (bold), I, (italic)
 A numerical representation 3, 2, or 1 (bold, italic, and Roman,
 respectively) may be used instead.
 A text decoration is valid within
-the current font scope only:  if a macro opens a font scope alongside
+the current font scope only: if a macro opens a font scope alongside
 its own scope, such as
 .Sx \&Bf
 .Cm \&Sy ,
@@ -167,7 +167,7 @@ also defined a set of package-specific
 .Dq predefined strings ,
 which, like
 .Sx Special Characters ,
-demark special output characters and strings by way of input codes.
+mark special output characters and strings by way of input codes.
 Predefined strings are escaped with the slash-asterisk,
 .Sq \e* :
 single-character
@@ -301,10 +301,18 @@ When composing a manual, make sure that your sentences
 a line.
 By doing so, front-ends will be able to apply the proper amount of
 spacing after the end of sentence (unescaped) period, exclamation mark,
-or question mark.
+or question mark followed by zero or more non-sentence closing
+delimiters (
+.Ns Sq \&) ,
+.Sq \&] ,
+.Sq \&' ,
+.Sq \&" ) .
 .Pp
 The proper spacing is also intelligently preserved if a sentence ends at
-the boundary of a macro line.
+the boundary of a macro line, e.g.,
+.Pp
+.D1 \&Xr mandoc 1 \.
+.D1 \&Fl T \&Ns \&Cm ascii \.
 .Sh MANUAL STRUCTURE
 A well-formed
 .Nm
@@ -325,8 +333,11 @@ must be the NAME section, consisting of at least one
 followed by
 .Sx \&Nd .
 .Pp
-Following that, convention dictates specifying at least the SYNOPSIS and
-DESCRIPTION sections, although this varies between manual sections.
+Following that, convention dictates specifying at least the
+.Em SYNOPSIS
+and
+.Em DESCRIPTION
+sections, although this varies between manual sections.
 .Pp
 The following is a well-formed skeleton
 .Nm
@@ -335,18 +346,15 @@ file:
 \&.Dd $\&Mdocdate$
 \&.Dt mdoc 7
 \&.Os
-\&.
 \&.Sh NAME
 \&.Nm foo
 \&.Nd a description goes here
-\&.\e\*q The next is for sections 2 & 3 only.
+\&.\e\*q The next is for sections 2, 3, & 9 only.
 \&.\e\*q .Sh LIBRARY
-\&.
 \&.Sh SYNOPSIS
 \&.Nm foo
 \&.Op Fl options
 \&.Ar
-\&.
 \&.Sh DESCRIPTION
 The
 \&.Nm
@@ -401,7 +409,7 @@ and
 .Sx \&Nd .
 .It Em LIBRARY
 The name of the library containing the documented material, which is
-assumed to be a function in a section 2 or 3 manual.
+assumed to be a function in a section 2, 3, or 9 manual.
 The syntax for this is as follows:
 .Bd -literal -offset indent
 \&.Lb libarm
@@ -445,13 +453,44 @@ And for the third, configurations (section 4):
 Manuals not in these sections generally don't need a
 .Em SYNOPSIS .
 .Pp
-See
-.Sx \&Op ,
+Some macros are displayed differently in the
+.Em SYNOPSIS
+section, particularly
+.Sx \&Nm ,
 .Sx \&Cd ,
+.Sx \&Fd ,
 .Sx \&Fn ,
-.Sx \&Ft ,
+.Sx \&Fo ,
+.Sx \&In ,
+.Sx \&Vt ,
 and
-.Sx \&Vt .
+.Sx \&Ft .
+All of these macros are output on their own line.  If two such
+dissimilar macros are pair-wise invoked (except for
+.Sx \&Ft
+before
+.Sx \&Fo
+or
+.Sx \&Fn ) ,
+they are separated by a vertical space, unless in the case of
+.Sx \&Fo ,
+.Sx \&Fn ,
+and
+.Sx \&Ft ,
+which are always separated by vertical space.
+.Pp
+When text and macros following an
+.Sx \&Nm
+macro starting an input line span multiple output lines,
+all output lines but the first will be indented to align
+with the text immediately following the
+.Sx \&Nm
+macro, up to the next
+.Sx \&Nm ,
+.Sx \&Sx ,
+or
+.Sx \&Ss
+macro or the end of an enclosing block, whichever comes first.
 .It Em DESCRIPTION
 This expands upon the brief, one-line description in
 .Em NAME .
@@ -646,9 +685,20 @@ has multiple heads.
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope
 .It Sx \&It  Ta    \&No     Ta    Yes      Ta    closed by Sx \&It , Sx \&El
 .It Sx \&Nd  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh
+.It Sx \&Nm  Ta    \&No     Ta  Yes Ta closed by Sx \&Nm , Sx \&Sh , Sx \&Ss
 .It Sx \&Sh  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh
 .It Sx \&Ss  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh , Sx \&Ss
 .El
+.Pp
+Note that the
+.Sx \&Nm
+macro is a
+.Sx Block full-implicit
+macro only when invoked as the first macro
+in a
+.Em SYNOPSIS
+section line, else it is
+.Sx In-line .
 .Ss Block partial-explicit
 Like block full-explicit, but also with single-line scope.
 Each has at least a body and, in limited circumstances, a head
@@ -723,7 +773,9 @@ Note that the
 macro is a
 .Sx Block partial-implicit
 only when invoked as the first macro
-in a SYNOPSIS section line, else it is
+in a
+.Em SYNOPSIS
+section line, else it is
 .Sx In-line .
 .Ss In-line
 Closed by
@@ -945,7 +997,7 @@ See also
 .Sx \&Aq .
 .Ss \&Ap
 Inserts an apostrophe without any surrounding white-space.
-This is generally used as a grammatic device when referring to the verb
+This is generally used as a grammatical device when referring to the verb
 form of a function:
 .Bd -literal -offset indent
 \&.Fn execve Ap d
@@ -1066,10 +1118,7 @@ As a scaling unit following the syntax described in
 As the calculated string length of the opaque string.
 .El
 .Pp
-If unset, it will revert to the value of
-.Ar 8n
-as described in
-.Sx Scaling Widths .
+If not provided an argument, it will be ignored.
 .It Fl compact
 Do not assert a vertical space before the block.
 .It Fl file Ar file
@@ -1090,7 +1139,62 @@ See also
 and
 .Sx \&Dl .
 .Ss \&Bf
+Change the font mode for a scoped block of text.
+Its syntax is as follows:
+.Bd -ragged -offset indent
+.Pf \. Sx \&Bf
+.Oo
+.Fl emphasis | literal | symbolic |
+.Cm \&Em | \&Li | \&Sy
+.Oc
+.Ed
+.Pp
+The
+.Fl emphasis
+and
+.Cm \&Em
+argument are equivalent, as are
+.Fl symbolic
+and
+.Cm \&Sy,
+and
+.Fl literal
+and
+.Cm \&Li .
+Without an argument, this macro does nothing.
+The font mode continues until broken by a new font mode in a nested
+scope or
+.Sx \&Ef
+is encountered.
+.Pp
+See also
+.Sx \&Li ,
+.Sx \&Ef ,
+and
+.Sx \&Sy .
 .Ss \&Bk
+Begins a keep block, containing a collection of macros or text
+to be kept together in the output.
+One argument is required; additional arguments are ignored.
+Currently, the only argument implemented is
+.Fl words ,
+requesting to keep together all words of the contained text
+on the same output line.
+A
+.Fl lines
+argument to keep together all lines of the contained text
+on the same page has been desired for a long time,
+but has never been implemented.
+.Pp
+Examples:
+.Bd -literal -offset indent
+\&.Bk \-words
+\&.Op o Ar output_file
+\&.Ek
+.Ed
+.Pp
+See also
+.Sx \&Ek .
 .Ss \&Bl
 Begins a list composed of one or more list entries.
 A list is associated with a type, which is a required argument.
@@ -1129,22 +1233,18 @@ macro.
 These dictate the width of columns either as
 .Sx Scaling Widths
 or literal text.
-List entry bodies must be left empty.
-Column bodies have the following syntax:
-.Pp
-.D1 .It col1 <TAB> ... coln
-.D1 .It col1 Ta ... coln
-.D1 .It col1 <TAB> col2 Ta coln
-.Pp
-where columns may be separated by tabs, the literal string
-.Qq Ta ,
-or a mixture of both.
-These are equivalent except that quoted sections propogate over tabs,
-for example,
-.Pp
-.D1 .It \(dqcol1 ; <TAB> col2 ;\(dq ;
-.Pp
-will preserve the semicolon whitespace except for the last.
+If the initial macro of a
+.Fl column
+list is not an
+.Sx \&It ,
+an
+.Sx \&It
+context spanning each line is implied until an
+.Sx \&It
+line macro is encountered, at which point list bodies are interpreted as
+described in the
+.Sx \&It
+documentation.
 .It Fl dash
 A list offset by a dash (hyphen).
 The head of list entries must be empty.
@@ -1199,6 +1299,9 @@ after the head as specified by the
 .Fl width
 argument.
 .El
+.Pp
+See also
+.Sx \&It .
 .Ss \&Bo
 Begins a block enclosed by square brackets.
 Does not have any head arguments.
@@ -1326,6 +1429,11 @@ See also
 and
 .Sx \&Dl .
 .Ss \&Db
+Start a debugging context.
+This macro is parsed, but generally ignored.
+Its syntax is as follows:
+.Pp
+.D1 Pf \. Sx \&Db Cm on | off
 .Ss \&Dc
 Closes a
 .Sx \&Do
@@ -1335,9 +1443,9 @@ Document date.
 This is the mandatory first macro of any
 .Nm
 manual.
-Its calling syntax is as follows:
+Its syntax is as follows:
 .Pp
-.D1 \. Ns Sx \&Dd Cm date
+.D1 Pf \. Sx \&Dd Cm date
 .Pp
 The
 .Cm date
@@ -1396,15 +1504,25 @@ Document title.
 This is the mandatory second macro of any
 .Nm
 file.
-Its calling syntax is as follows:
+Its syntax is as follows:
+.Bd -ragged -offset indent
+.Pf \. Sx \&Dt
+.Oo
+.Cm title
+.Oo
+.Cm section
+.Op Cm volume | arch
+.Oc
+.Oc
+.Ed
 .Pp
-.D1 \. Ns Sx \&Dt Cm title section Op Cm volume | arch
-.Pp
 Its arguments are as follows:
 .Bl -tag -width Ds -offset Ds
 .It Cm title
-The document's title (name).
-This should be capitalised and is required.
+The document's title (name), defaulting to
+.Qq UNKNOWN
+if unspecified.
+It should be capitalised.
 .It Cm section
 The manual section.
 This may be one of
@@ -1441,8 +1559,9 @@ This may be one of
 or
 .Ar paper
 .Pq paper .
-It is also required and should correspond to the manual's filename
-suffix.
+It should correspond to the manual's filename suffix and defaults to
+.Qq 1
+if unspecified.
 .It Cm volume
 This overrides the volume inferred from
 .Ar section .
@@ -1514,7 +1633,6 @@ Examples:
 .D1 \&.Dt FOO 1
 .D1 \&.Dt FOO 4 KM
 .D1 \&.Dt FOO 9 i386
-.D1 \&.Dt FOO 9 KM i386
 .Pp
 See also
 .Sx \&Dd
@@ -1549,8 +1667,19 @@ and
 .Ss \&Ec
 .Ss \&Ed
 .Ss \&Ef
+Ends a font mode context started by
+.Sx \&Bf .
 .Ss \&Ek
+Ends a keep context started by
+.Sx \&Bk .
 .Ss \&El
+Ends a list context started by
+.Sx \&Bl .
+.Pp
+See also
+.Sx \&Bl
+and
+.Sx \&It .
 .Ss \&Em
 Denotes text that should be emphasised.
 Note that this is a presentation term and should not be used for
@@ -1590,8 +1719,47 @@ is not provided, the document's name as stipulated in
 .Sx \&Nm
 is provided.
 .Ss \&Fa
+Function argument.
+Its syntax is as follows:
+.Bd -ragged -offset indent
+.Pf \. Sx \&Fa
+.Op Cm argtype
+.Cm argname
+.Ed
+.Pp
+This may be invoked for names with or without the corresponding type.
+It is also used to specify the field name of a structure.
+Most often, the
+.Sx \&Fa
+macro is used in the
+.Em SYNOPSIS
+within
+.Sx \&Fo
+section when documenting multi-line function prototypes.
+If invoked with multiple arguments, the arguments are separated by a
+comma.
+Furthermore, if the following macro is another
+.Sx \&Fa ,
+the last argument will also have a trailing comma.
+.Pp
+Examples:
+.D1 \&.Fa \(dqconst char *p\(dq
+.D1 \&.Fa \(dqint a\(dq \(dqint b\(dq \(dqint c\(dq
+.D1 \&.Fa foo
+.Pp
+See also
+.Sx \&Fo .
 .Ss \&Fc
 .Ss \&Fd
+Historically used to document include files.
+This usage has been deprecated in favour of
+.Sx \&In .
+Do not use this macro.
+.Pp
+See also
+.Sx MANUAL STRUCTURE
+and
+.Sx \&In .
 .Ss \&Fl
 Command-line flag.
 Used when listing arguments to command-line utilities.
@@ -1611,9 +1779,80 @@ Examples:
 See also
 .Sx \&Cm .
 .Ss \&Fn
+A function name.
+Its syntax is as follows:
+.Bd -ragged -offset indent
+.Pf \. Ns Sx \&Fn
+.Op Cm functype
+.Cm funcname
+.Op Oo Cm argtype Oc Cm argname
+.Ed
+.Pp
+Function arguments are surrounded in parenthesis and
+are delimited by commas.
+If no arguments are specified, blank parenthesis are output.
+.Pp
+Examples:
+.D1 \&.Fn "int funcname" "int arg0" "int arg1"
+.D1 \&.Fn funcname "int arg0"
+.D1 \&.Fn funcname arg0
+.Bd -literal -offset indent -compact
+\&.Ft functype
+\&.Fn funcname
+.Ed
+.Pp
+See also
+.Sx MANUAL STRUCTURE
+and
+.Sx \&Ft .
 .Ss \&Fo
-.Ss \&Fr
+Begin a function block.
+This is a multi-line version of
+.Sx \&Fn .
+Its syntax is as follows:
+.Pp
+.D1 Pf \. Sx \&Fo Cm funcname
+.Pp
+Invocations usually occur in the following context:
+.Bd -ragged -offset indent
+.Pf \. Sx \&Ft Cm functype
+.br
+.Pf \. Sx \&Fo Cm funcname
+.br
+.Pf \. Sx \&Fa Oo Cm argtype Oc Cm argname
+.br
+\.\.\.
+.br
+.Pf \. Sx \&Fc
+.Ed
+.Pp
+A
+.Sx \&Fo
+scope is closed by
+.Pp
+See also
+.Sx MANUAL STRUCTURE ,
+.Sx \&Fa ,
+.Sx \&Fc ,
+and
 .Ss \&Ft
+A function type.
+Its syntax is as follows:
+.Pp
+.D1 Pf \. Sx \&Ft Cm functype
+.Pp
+Examples:
+.D1 \&.Ft int
+.Bd -literal -offset indent -compact
+\&.Ft functype
+\&.Fn funcname
+.Ed
+.Pp
+See also
+.Sx MANUAL STRUCTURE ,
+.Sx \&Fn ,
+and
+.Sx \&Fo .
 .Ss \&Fx
 Format the FreeBSD version provided as an argument, or a default value
 if no argument is provided.
@@ -1634,14 +1873,132 @@ and
 .Ss \&Hf
 .Ss \&Ic
 .Ss \&In
+An
+.Qq include
+file.
+In the
+.Em SYNOPSIS
+section (only if invoked as the line macro), the first argument is
+preceded by
+.Qq #include ,
+the arguments is enclosed in angled braces.
+.Pp
+Examples:
+.D1 \&.In sys/types
+.Pp
+See also
+.Sx MANUAL STRUCTURE .
 .Ss \&It
+A list item.
+The syntax of this macro depends on the list type.
+.Pp
+Lists
+of type
+.Fl hang ,
+.Fl ohang ,
+.Fl inset ,
+and
+.Fl diag
+have the following syntax:
+.Pp
+.D1 Pf \. Sx \&It Cm args
+.Pp
+Lists of type
+.Fl bullet ,
+.Fl dash ,
+.Fl enum ,
+.Fl hyphen
+and
+.Fl item
+have the following syntax:
+.Pp
+.D1 Pf \. Sx \&It
+.Pp
+with subsequent lines interpreted within the scope of the
+.Sx \&It
+until either a closing
+.Sx \&El
+or another
+.Sx \&It .
+.Pp
+The
+.Fl tag
+list has the following syntax:
+.Pp
+.D1 Pf \. Sx \&It Op Cm args
+.Pp
+Subsequent lines are interpreted as with
+.Fl bullet
+and family.
+The line arguments correspond to the list's left-hand side; body
+arguments correspond to the list's contents.
+.Pp
+The
+.Fl column
+list is the most complicated.
+Its syntax is as follows:
+.Pp
+.D1 Pf \. Sx \&It Op Cm args
+.Pp
+The
+.Cm args
+are phrases, a mix of macros and text corresponding to a line column,
+delimited by tabs or the special
+.Sq \&Ta
+pseudo-macro.
+Lines subsequent the
+.Sx \&It
+are interpreted within the scope of the last phrase.
+Calling the pseudo-macro
+.Sq \&Ta
+will open a new phrase scope (this must occur on a macro line to be
+interpreted as a macro).  Note that the tab phrase delimiter may only be
+used within the
+.Sx \&It
+line itself.
+Subsequent this, only the
+.Sq \&Ta
+pseudo-macro may be used to delimit phrases.
+Furthermore, note that quoted sections propagate over tab-delimited
+phrases on an
+.Sx \&It ,
+for example,
+.Pp
+.D1 .It \(dqcol1 ; <TAB> col2 ;\(dq \&;
+.Pp
+will preserve the semicolon whitespace except for the last.
+.Pp
+See also
+.Sx \&Bl .
 .Ss \&Lb
+Specify a library.
+The syntax is as follows:
+.Pp
+.D1 Pf \. Sx \&Lb Cm library
+.Pp
+The
+.Cm library
+parameter may be a system library, such as
+.Cm libz
+or
+.Cm libpam ,
+in which case a small library description is printed next to the linker
+invocation; or a custom library, in which case the library name is
+printed in quotes.
+This is most commonly used in the
+.Em SYNOPSIS
+section as described in
+.Sx MANUAL STRUCTURE .
+.Pp
+Examples:
+.D1 \&.Lb libz
+.D1 \&.Lb mdoc
 .Ss \&Li
 .Ss \&Lk
 Format a hyperlink.
-The calling syntax is as follows:
+Its syntax is as follows:
 .Pp
-.D1 \. Ns Sx \&Lk Cm uri Op Cm name
+.D1 Pf \. Sx \&Lk Cm uri Op Cm name
 .Pp
 Examples:
 .D1 \&.Lk http://bsd.lv "The BSD.lv Project"
@@ -1652,8 +2009,53 @@ See also
 .Ss \&Lp
 .Ss \&Ms
 .Ss \&Mt
+Format a
+.Qq mailto:
+hyperlink.
+Its syntax is as follows:
+.Pp
+.D1 Pf \. Sx \&Mt Cm address
+.Pp
+Examples:
+.D1 \&.Mt discuss@manpages.bsd.lv
 .Ss \&Nd
 .Ss \&Nm
+The name of the manual page, or \(em in particular in section 1, 6,
+and 8 pages \(em of an additional command or feature documented in
+the manual page.
+When first invoked, the
+.Sx \&Nm
+macro expects a single argument, the name of the manual page.
+Usually, the first invocation happens in the
+.Em NAME
+section of the page.
+The specified name will be remembered and used whenever the macro is
+called again without arguments later in the page.
+The
+.Sx \&Nm
+macro uses
+.Sx Block full-implicit
+semantics when invoked as the first macro on an input line in the
+.Em SYNOPSIS
+section; otherwise, it uses ordinary
+.Sx In-line
+semantics.
+.Pp
+Examples:
+.Bd -literal -offset indent
+\&.Sh SYNOPSIS
+\&.Nm cat
+\&.Op Fl benstuv
+\&.Op Ar
+.Ed
+.Pp
+In the
+.Em SYNOPSIS
+of section 2, 3 and 9 manual pages, use the
+.Sx \&Fn
+macro rather than
+.Sx \&Nm
+to mark up the name of the manual page.
 .Ss \&No
 .Ss \&Ns
 .Ss \&Nx
@@ -1681,9 +2083,10 @@ Document operating system version.
 This is the mandatory third macro of
 any
 .Nm
-file.  Its calling syntax is as follows:
+file.
+Its syntax is as follows:
 .Pp
-.D1 \. Ns Sx \&Os Op Cm system
+.D1 Pf \. Sx \&Os Op Cm system
 .Pp
 The optional
 .Cm system
@@ -1755,6 +2158,7 @@ The block macro may only contain
 .Sx \&%Q ,
 .Sx \&%R ,
 .Sx \&%T ,
+.Sx \&%U ,
 and
 .Sx \&%V
 child macros (at least one must be specified).
@@ -1788,6 +2192,8 @@ line.
 .Ss \&Sy
 .Ss \&Tn
 .Ss \&Ud
+Prints out
+.Dq currently under development.
 .Ss \&Ux
 Format the UNIX name.
 Accepts no argument.
@@ -1807,12 +2213,14 @@ and
 .Ss \&Va
 .Ss \&Vt
 A variable type.
-This is also used for indicating global variables in the SYNOPSIS
+This is also used for indicating global variables in the
+.Em SYNOPSIS
 section, in which case a variable name is also specified.
 Note that it accepts
 .Sx Block partial-implicit
-syntax when invoked as the first macro in the SYNOPSIS section, else it
-accepts ordinary
+syntax when invoked as the first macro in the
+.Em SYNOPSIS
+section, else it accepts ordinary
 .Sx In-line
 syntax.
 .Pp
@@ -1822,10 +2230,10 @@ which is used for function return types.
 .Pp
 Examples:
 .D1 \&.Vt unsigned char
-.D1 \&.Vt extern const char * const sys_signame[] ;
+.D1 \&.Vt extern const char * const sys_signame[] \&;
 .Pp
 See also
-.Sx \&Ft
+.Sx MANUAL STRUCTURE
 and
 .Sx \&Va .
 .Ss \&Xc
@@ -1838,9 +2246,9 @@ since this limit has been lifted, the macro has been d
 .Ss \&Xr
 Link to another manual
 .Pq Qq cross-reference .
-Its calling syntax is
+Its syntax is as follows:
 .Pp
-.D1 \. Ns Sx \&Xr Cm name section
+.D1 Pf \. Sx \&Xr Cm name section
 .Pp
 The
 .Cm name
@@ -1857,7 +2265,7 @@ This behaviour is for compatibility with
 .Pp
 Examples:
 .D1 \&.Xr mandoc 1
-.D1 \&.Xr mandoc 1 ;
+.D1 \&.Xr mandoc 1 \&;
 .D1 \&.Xr mandoc 1 \&Ns s behaviour
 .Ss \&br
 .Ss \&sp
@@ -1877,6 +2285,52 @@ Heirloom troff, the other significant troff implementa
 .Pp
 .Bl -dash -compact
 .It
+Old groff fails to assert a newline before
+.Sx \&Bd Fl ragged compact .
+.It
+groff behaves inconsistently when encountering
+.Pf non- Sx \&Fa
+children of
+.Sx \&Fo
+regarding spacing between arguments.
+In mandoc, this is not the case: each argument is consistently followed
+by a single space and the trailing
+.Sq \&)
+suppresses prior spacing.
+.It
+groff behaves inconsistently when encountering
+.Sx \&Ft
+and
+.Sx \&Fn
+in the
+.Em SYNOPSIS :
+at times newline(s) are suppressed depending on whether a prior
+.Sx \&Fn
+has been invoked.
+In mandoc, this is not the case.
+See
+.Sx \&Ft
+and
+.Sx \&Fn
+for the normalised behaviour.
+.It
+Historic groff does not break before an
+.Sx \&Fn
+when not invoked as the line macro in the
+.Em SYNOPSIS
+section.
+.It
+Historic groff formats the
+.Sx \&In
+badly: trailing arguments are trashed and
+.Em SYNOPSIS
+is not specially treated.
+.It
+groff does not accept the
+.Sq \&Ta
+pseudo-macro as a line macro.
+mandoc does.
+.It
 The comment syntax
 .Sq \e."
 is no longer accepted.
@@ -1908,16 +2362,15 @@ In quoted literals, groff allowed pair-wise double-quo
 standalone double-quote in formatted output.
 This idiosyncratic behaviour is not applicable in mandoc.
 .It
-Display types
+Display offsets
 .Sx \&Bd
-.Fl center
+.Fl offset Ar center
 and
-.Fl right
-are aliases for
-.Fl left
-in manodc.  Furthermore, the
+.Fl offset Ar right
+are disregarded in mandoc.
+Furthermore, the
 .Fl file Ar file
-argument is ignored.
+argument is not supported in mandoc.
 Lastly, since text is not right-justified in mandoc (or even groff),
 .Fl ragged
 and
@@ -1949,15 +2402,11 @@ delimiter to render.
 This is not supported in mandoc.
 .It
 In groff, the
-.Sx \&Fo
-macro only produces the first parameter.
-This is not the case in mandoc.
-.It
-In groff, the
 .Sx \&Cd ,
 .Sx \&Er ,
+.Sx \&Ex ,
 and
-.Sx \&Ex
+.Sx \&Rv
 macros were stipulated only to occur in certain manual sections.
 mandoc does not have these restrictions.
 .It