===================================================================
RCS file: /cvs/mandoc/mdoc.7,v
retrieving revision 1.98
retrieving revision 1.110
diff -u -p -r1.98 -r1.110
--- mandoc/mdoc.7	2010/05/08 22:26:39	1.98
+++ mandoc/mdoc.7	2010/05/26 10:39:35	1.110
@@ -1,4 +1,4 @@
-.\"	$Id: mdoc.7,v 1.98 2010/05/08 22:26:39 kristaps Exp $
+.\"	$Id: mdoc.7,v 1.110 2010/05/26 10:39:35 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 8 2010 $
+.Dd $Mdocdate: May 26 2010 $
 .Dt MDOC 7
 .Os
 .Sh NAME
@@ -101,9 +101,11 @@ for two-character sequences; an open-bracket
 .Sq \&[
 for n-character sequences (terminated at a close-bracket
 .Sq \&] ) ;
-or a single one-character sequence.  See
+or a single one-character sequence.
+See
 .Xr mandoc_char 7
-for a complete list.  Examples include
+for a complete list.
+Examples include
 .Sq \e(em
 .Pq em-dash
 and
@@ -118,14 +120,16 @@ escape followed by an indicator: B (bold), I, (italic)
 .D1 \efBbold\efR \efIitalic\efP
 .Pp
 A numerical representation 3, 2, or 1 (bold, italic, and Roman,
-respectively) may be used instead.  A text decoration is valid within
+respectively) may be used instead.
+A text decoration is valid within
 the current font scope only:  if a macro opens a font scope alongside
 its own scope, such as
 .Sx \&Bf
 .Cm \&Sy ,
 in-scope invocations of
 .Sq \ef
-are only valid within the font scope of the macro.  If
+are only valid within the font scope of the macro.
+If
 .Sq \ef
 is specified outside of any font scope, such as in unenclosed, free-form
 text, it will affect the remainder of the document.
@@ -174,7 +178,8 @@ and N-character
 .Sq \e*[N] .
 See
 .Xr mandoc_char 7
-for a complete list.  Examples include
+for a complete list.
+Examples include
 .Sq \e*(Am
 .Pq ampersand
 and
@@ -187,14 +192,14 @@ trailing spaces are stripped from input (unless in a l
 Blank free-form lines, which may include whitespace, are only permitted
 within literal contexts.
 .Pp
-In macro lines, whitespace delimits arguments and is discarded.  If
-arguments are quoted, whitespace within the quotes is retained.
+In macro lines, whitespace delimits arguments and is discarded.
+If arguments are quoted, whitespace within the quotes is retained.
 .Ss Quotation
 Macro arguments may be quoted with a double-quote to group
-space-delimited terms or to retain blocks of whitespace.  A quoted
-argument begins with a double-quote preceded by whitespace.  The next
-double-quote not pair-wise adjacent to another double-quote terminates
-the literal, regardless of surrounding whitespace.
+space-delimited terms or to retain blocks of whitespace.
+A quoted argument begins with a double-quote preceded by whitespace.
+The next double-quote not pair-wise adjacent to another double-quote
+terminates the literal, regardless of surrounding whitespace.
 .Pp
 This produces tokens
 .Sq a" ,
@@ -203,7 +208,8 @@ This produces tokens
 and
 .Sq fg" .
 Note that any quoted term, be it argument or macro, is indiscriminately
-considered literal text.  Thus, the following produces
+considered literal text.
+Thus, the following produces
 .Sq \&Em a :
 .Bd -literal -offset indent
 \&.Em "Em a"
@@ -213,16 +219,18 @@ In free-form mode, quotes are regarded as opaque text.
 .Ss Dates
 There are several macros in
 .Nm
-that require a date argument.  The canonical form for dates is the
-American format:
+that require a date argument.
+The canonical form for dates is the American format:
 .Pp
 .D1 Cm Month Day , Year
 .Pp
 The
 .Cm Day
-value is an optionally zero-padded numeral.  The
+value is an optionally zero-padded numeral.
+The
 .Cm Month
-value is the full month name.  The
+value is the full month name.
+The
 .Cm Year
 value is the full four-digit year.
 .Pp
@@ -246,8 +254,8 @@ stipulating a two-inch list indentation with the follo
 The syntax for scaled widths is
 .Sq Li [+-]?[0-9]*.[0-9]*[:unit:] ,
 where a decimal must be preceded or proceeded by at least one digit.
-Negative numbers, while accepted, are truncated to zero.  The following
-scaling units are accepted:
+Negative numbers, while accepted, are truncated to zero.
+The following scaling units are accepted:
 .Pp
 .Bl -tag -width Ds -offset indent -compact
 .It c
@@ -285,8 +293,26 @@ Using anything other than
 .Sq u ,
 or
 .Sq v
-is necessarily non-portable across output media.  See
+is necessarily non-portable across output media.
+See
 .Sx COMPATIBILITY .
+.Ss Sentence Spacing
+When composing a manual, make sure that your sentences end at the end of
+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 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, e.g.,
+.Pp
+.D1 \&Xr mandoc 1 \.
+.D1 \&Fl T \&Ns \&Cm ascii \.
 .Sh MANUAL STRUCTURE
 A well-formed
 .Nm
@@ -321,7 +347,7 @@ file:
 \&.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
@@ -334,13 +360,13 @@ The
 \&.Nm
 utility processes files ...
 \&.\e\*q .Sh IMPLEMENTATION NOTES
-\&.\e\*q The next is for sections 1 & 8 only.
-\&.\e\*q .Sh EXIT STATUS
 \&.\e\*q The next is for sections 2, 3, & 9 only.
 \&.\e\*q .Sh RETURN VALUES
 \&.\e\*q The next is for sections 1, 6, 7, & 8 only.
 \&.\e\*q .Sh ENVIRONMENT
 \&.\e\*q .Sh FILES
+\&.\e\*q The next is for sections 1 & 8 only.
+\&.\e\*q .Sh EXIT STATUS
 \&.\e\*q .Sh EXAMPLES
 \&.\e\*q The next is for sections 1, 4, 6, 7, & 8 only.
 \&.\e\*q .Sh DIAGNOSTICS
@@ -358,12 +384,12 @@ utility processes files ...
 .Pp
 The sections in a
 .Nm
-document are conventionally ordered as they appear above.  Sections
-should be composed as follows:
+document are conventionally ordered as they appear above.
+Sections should be composed as follows:
 .Bl -ohang -offset Ds
 .It Em NAME
-The name(s) and a short description of the documented material.  The
-syntax for this as follows:
+The name(s) and a short description of the documented material.
+The syntax for this as follows:
 .Bd -literal -offset indent
 \&.Nm name0
 \&.Nm name1
@@ -383,8 +409,8 @@ 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.  The syntax for
-this is as follows:
+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
 .Ed
@@ -449,25 +475,14 @@ Print verbose information.
 .Pp
 Manuals not documenting a command won't include the above fragment.
 .It Em IMPLEMENTATION NOTES
-Implementation-specific notes should be kept here.  This is useful when
-implementing standard functions that may have side effects or notable
-algorithmic implications.
-.It Em EXIT STATUS
-Command exit status for section 1, 6, and 8 manuals.  This section is
-the dual of
-.Em RETURN VALUES ,
-which is used for functions.  Historically, this information was
-described in
-.Em DIAGNOSTICS ,
-a practise that is now discouraged.
-.Pp
-See
-.Sx \&Ex .
+Implementation-specific notes should be kept here.
+This is useful when implementing standard functions that may have side
+effects or notable algorithmic implications.
 .It Em RETURN VALUES
 This section is the dual of
 .Em EXIT STATUS ,
-which is used for commands.  It documents the return values of functions
-in sections 2, 3, and 9.
+which is used for commands.
+It documents the return values of functions in sections 2, 3, and 9.
 .Pp
 See
 .Sx \&Rv .
@@ -478,17 +493,30 @@ Documents any usages of environment variables, e.g.,
 See
 .Sx \&Ev .
 .It Em FILES
-Documents files used.  It's helpful to document both the file and a
-short description of how the file is used (created, modified, etc.).
+Documents files used.
+It's helpful to document both the file and a short description of how
+the file is used (created, modified, etc.).
 .Pp
 See
 .Sx \&Pa .
+.It Em EXIT STATUS
+Command exit status for section 1, 6, and 8 manuals.
+This section is the dual of
+.Em RETURN VALUES ,
+which is used for functions.
+Historically, this information was described in
+.Em DIAGNOSTICS ,
+a practise that is now discouraged.
+.Pp
+See
+.Sx \&Ex .
 .It Em EXAMPLES
-Example usages.  This often contains snippets of well-formed,
-well-tested invocations.  Make doubly sure that your examples work
-properly!
+Example usages.
+This often contains snippets of well-formed, well-tested invocations.
+Make doubly sure that your examples work properly!
 .It Em DIAGNOSTICS
-Documents error conditions.  This is most useful in section 4 manuals.
+Documents error conditions.
+This is most useful in section 4 manuals.
 Historically, this section was used in place of
 .Em EXIT STATUS
 for manuals in sections 1, 6, and 8; however, this practise is
@@ -503,15 +531,16 @@ Documents error handling in sections 2, 3, and 9.
 See
 .Sx \&Er .
 .It Em SEE ALSO
-References other manuals with related topics.  This section should exist
-for most manuals.  Cross-references should conventionally be ordered
-first by section, then alphabetically.
+References other manuals with related topics.
+This section should exist for most manuals.
+Cross-references should conventionally be ordered first by section, then
+alphabetically.
 .Pp
 See
 .Sx \&Xr .
 .It Em STANDARDS
-References any standards implemented or used.  If not adhering to any
-standards, the
+References any standards implemented or used.
+If not adhering to any standards, the
 .Em HISTORY
 section should be used instead.
 .Pp
@@ -539,15 +568,17 @@ Documents any security precautions that operators shou
 Macros are one to three three characters in length and begin with a
 control character ,
 .Sq \&. ,
-at the beginning of the line.  An arbitrary amount of whitespace may
-sit between the control character and the macro name.  Thus, the
-following are equivalent:
+at the beginning of the line.
+An arbitrary amount of whitespace may sit between the control character
+and the macro name.
+Thus, the following are equivalent:
 .Bd -literal -offset indent
 \&.Pp
 \&.\ \ \ \&Pp
 .Ed
 .Pp
-The syntax of a macro depends on its classification.  In this section,
+The syntax of a macro depends on its classification.
+In this section,
 .Sq \-arg
 refers to macro arguments, which may be followed by zero or more
 .Sq parm
@@ -560,8 +591,9 @@ closes it out.
 The
 .Em Callable
 column indicates that the macro may be called subsequent to the initial
-line-macro.  If a macro is not callable, then its invocation after the
-initial line macro is interpreted as opaque text, such that
+line-macro.
+If a macro is not callable, then its invocation after the initial line
+macro is interpreted as opaque text, such that
 .Sq \&.Fl \&Sh
 produces
 .Sq Fl \&Sh .
@@ -569,15 +601,16 @@ produces
 The
 .Em Parsable
 column indicates whether the macro may be followed by further
-(ostensibly callable) macros.  If a macro is not parsable, subsequent
-macro invocations on the line will be interpreted as opaque text.
+(ostensibly callable) macros.
+If a macro is not parsable, subsequent macro invocations on the line
+will be interpreted as opaque text.
 .Pp
 The
 .Em Scope
 column, if applicable, describes closure rules.
 .Ss Block full-explicit
-Multi-line scope closed by an explicit closing macro.  All macros
-contains bodies; only
+Multi-line scope closed by an explicit closing macro.
+All macros contains bodies; only
 .Sx \&Bf
 contains a head.
 .Bd -literal -offset indent
@@ -625,8 +658,8 @@ has multiple heads.
 .It Sx \&Ss  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh , Sx \&Ss
 .El
 .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
+Like block full-explicit, but also with single-line scope.
+Each has at least a body and, in limited circumstances, a head
 .Po
 .Sx \&Fo ,
 .Sx \&Eo
@@ -698,14 +731,16 @@ 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
 .Sx Reserved Characters ,
-end of line, fixed argument lengths, and/or subsequent macros.  In-line
-macros have only text children.  If a number (or inequality) of
-arguments is
+end of line, fixed argument lengths, and/or subsequent macros.
+In-line macros have only text children.
+If a number (or inequality) of arguments is
 .Pq n ,
 then the macro accepts an arbitrary number of arguments.
 .Bd -literal -offset indent
@@ -795,7 +830,8 @@ then the macro accepts an arbitrary number of argument
 .El
 .Sh REFERENCE
 This section is a canonical reference of all macros, arranged
-alphabetically.  For the scoping of individual macros, see
+alphabetically.
+For the scoping of individual macros, see
 .Sx MACRO SYNTAX .
 .Ss \&%A
 Author name of an
@@ -876,8 +912,9 @@ Examples:
 .D1 \&.Ad [0,$]
 .D1 \&.Ad 0x00000000
 .Ss \&An
-Author name.  This macro may alternatively accepts the following
-arguments, although these may not be specified along with a parameter:
+Author name.
+This macro may alternatively accepts the following arguments, although
+these may not be specified along with a parameter:
 .Bl -tag -width 12n -offset indent
 .It Fl split
 Renders a line break before each author listing.
@@ -888,10 +925,11 @@ The opposite of
 .Pp
 In the AUTHORS section, the default is not to split the first author
 listing, but all subsequent author listings, whether or not they're
-interspersed by other macros or text, are split.  Thus, specifying
+interspersed by other macros or text, are split.
+Thus, specifying
 .Fl split
-will cause the first listing also to be split.  If not in the AUTHORS
-section, the default is not to split.
+will cause the first listing also to be split.
+If not in the AUTHORS section, the default is not to split.
 .Pp
 Examples:
 .D1 \&.An -nosplit
@@ -907,8 +945,8 @@ are re-set when entering the AUTHORS section, so if on
 in the general document body, it must be re-specified in the AUTHORS
 section.
 .Ss \&Ao
-Begins a block enclosed by angled brackets.  Does not have any head
-arguments.
+Begins a block enclosed by angled brackets.
+Does not have any head arguments.
 .Pp
 Examples:
 .D1 \&.Fl -key= \&Ns \&Ao \&Ar val \&Ac
@@ -916,9 +954,9 @@ Examples:
 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 form of
-a function:
+Inserts an apostrophe without any surrounding white-space.
+This is generally used as a grammatic device when referring to the verb
+form of a function:
 .Bd -literal -offset indent
 \&.Fn execve Ap d
 .Ed
@@ -941,7 +979,8 @@ statements, which should use
 See also
 .Sx \&Ao .
 .Ss \&Ar
-Command arguments.  If an argument is not provided, the string
+Command arguments.
+If an argument is not provided, the string
 .Dq file ...
 is used as a default.
 .Pp
@@ -950,7 +989,8 @@ Examples:
 .D1 \&.Ar
 .D1 \&.Ar arg1 , arg2 .
 .Ss \&At
-Formats an AT&T version.  Accepts at most one parameter:
+Formats an AT&T version.
+Accepts at most one parameter:
 .Bl -tag -width 12n -offset indent
 .It Cm v[1-7] | 32v
 A version of
@@ -980,10 +1020,11 @@ Closes a
 .Sx \&Bo
 block.  Does not have any tail arguments.
 .Ss \&Bd
-Begins a display block.  A display is collection of macros or text which
-may be collectively offset or justified in a manner different from that
-of the enclosing context.  By default, the block is preceded by a
-vertical space.
+Begins a display block.
+A display is collection of macros or text which may be collectively
+offset or justified in a manner different from that
+of the enclosing context.
+By default, the block is preceded by a vertical space.
 .Pp
 Each display is associated with a type, which must be one of the
 following arguments:
@@ -1001,7 +1042,8 @@ Alias for
 Centre-justify each line.
 .El
 .Pp
-The type must be provided first.  Secondary arguments are as follows:
+The type must be provided first.
+Secondary arguments are as follows:
 .Bl -tag -width 12n -offset indent
 .It Fl offset Ar width
 Offset by the value of
@@ -1022,8 +1064,8 @@ which justifies to the right margin; and
 .Ar center ,
 which aligns around an imagined centre axis.
 .It
-As a precalculated width for a named macro.  The most popular is the
-imaginary macro
+As a precalculated width for a named macro.
+The most popular is the imaginary macro
 .Ar \&Ds ,
 which resolves to
 .Ar 6n .
@@ -1060,63 +1102,116 @@ and
 .Ss \&Bf
 .Ss \&Bk
 .Ss \&Bl
-.\" Begins a list composed of one or more list entries.  A list entry is
-.\" specified by the
-.\" .Sx \&It
-.\" macro, which consists of a head and optional body.  By default, a list
-.\" is preceded by a blank line.  A list must specify one of the following
-.\" list types:
-.\" .Bl -tag -width 12n
-.\" .It Fl bullet
-.\" A list offset by a bullet.  The head of list entries must be empty.
-.\" List entry bodies are justified after the bullet.
-.\" .It Fl column
-.\" A columnated list.  The number of columns is specified as arguments to
-.\" the
-.\" .Sx \&Bl
-.\" macro (the deprecated form of following the invocation of
-.\" .Fl column
-.\" is also accepted).  Arguments dictate the width of columns specified in
-.\" list entries.  List entry bodies must be left empty.  Columns specified
-.\" in the list entry head are justified to their position in the sequence
-.\" of columns.
-.\" .It Fl dash
-.\" A list offset by a dash (hyphen).  The head of list entries must be
-.\" empty.  List entry bodies are justified past the dash.
-.\" .It Fl diag
-.\" Like
-.\" .Fl inset
-.\" lists, but with additional formatting to the head.
-.\" .It Fl enum
-.\" A list offset by a number indicating list entry position.  The head of
-.\" list entries must be empty.  List entry bodies are justified past the
-.\" enumeration.
-.\" .It Fl hang
-.\" Like
-.\" .Fl tag ,
-.\" but instead of list bodies justifying to the head on the first line,
-.\" they trail the head text.
-.\" .It Fl hyphen
-.\" Synonym for
-.\" .Fl dash .
-.\" .It Fl inset
-.\" Like
-.\" .Fl tag ,
-.\" but list entry bodies aren't justified.
-.\" .It Fl item
-.\" An un-justified list.  This produces blocks of text.
-.\" .It Fl ohang
-.\" List bodies are placed on the line following the head.
-.\" .It Fl tag
-.\" A list offset by list entry heads.  List entry bodies are justified
-.\" after the head.
-.\" .El
-.\" .Pp
-.\" More...
-.\" .
+Begins a list composed of one or more list entries.
+A list is associated with a type, which is a required argument.
+Other arguments are
+.Fl width ,
+defined per-type as accepting a literal or
+.Sx Scaling Widths
+value;
+.Fl offset ,
+also accepting a literal or
+.Sx Scaling Widths
+value setting the list's global offset; and
+.Fl compact ,
+suppressing the default vertical space printed before each list entry.
+A list entry is specified by the
+.Sx \&It
+macro, which consists of a head and optional body (depending on the list
+type).
+A list must specify one of the following list types:
+.Bl -tag -width 12n -offset indent
+.It Fl bullet
+A list offset by a bullet.
+The head of list entries must be empty.
+List entry bodies are positioned after the bullet.
+The
+.Fl width
+argument varies the width of list bodies' left-margins.
+.It Fl column
+A columnated list.
+The
+.Fl width
+argument has no effect.
+The number of columns is specified as parameters to the
+.Sx \&Bl
+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.
+.It Fl dash
+A list offset by a dash (hyphen).
+The head of list entries must be empty.
+List entry bodies are positioned past the dash.
+The
+.Fl width
+argument varies the width of list bodies' left-margins.
+.It Fl diag
+Like
+.Fl inset ,
+but with additional formatting to the head.
+The
+.Fl width
+argument varies the width of list bodies' left-margins.
+.It Fl enum
+An enumerated list offset by the enumeration from 1.
+The head of list entries must be empty.
+List entry bodies are positioned after the enumeration.
+The
+.Fl width
+argument varies the width of list bodies' left-margins.
+.It Fl hang
+Like
+.Fl tag ,
+but instead of list bodies positioned after the head, they trail the
+head text.
+The
+.Fl width
+argument varies the width of list bodies' left-margins.
+.It Fl hyphen
+Synonym for
+.Fl dash .
+.It Fl inset
+List bodies follow the list head.
+The
+.Fl width
+argument is ignored.
+.It Fl item
+This produces blocks of text.
+The head of list entries must be empty.
+The
+.Fl width
+argument is ignored.
+.It Fl ohang
+List bodies are positioned on the line following the head.
+The
+.Fl width
+argument is ignored.
+.It Fl tag
+A list offset by list entry heads.  List entry bodies are positioned
+after the head as specified by the
+.Fl width
+argument.
+.El
 .Ss \&Bo
-Begins a block enclosed by square brackets.  Does not have any head
-arguments.
+Begins a block enclosed by square brackets.
+Does not have any head arguments.
 .Pp
 Examples:
 .Bd -literal -offset indent
@@ -1147,8 +1242,8 @@ Closes a
 .Sx \&Bro
 block.  Does not have any tail arguments.
 .Ss \&Bro
-Begins a block enclosed by curly braces.  Does not have any head
-arguments.
+Begins a block enclosed by curly braces.
+Does not have any head arguments.
 .Pp
 Examples:
 .Bd -literal -offset indent
@@ -1204,7 +1299,8 @@ See also
 and
 .Sx \&Ux .
 .Ss \&Cd
-Configuration declaration.  This denotes strings accepted by
+Configuration declaration.
+This denotes strings accepted by
 .Xr config 8 .
 .Pp
 Examples:
@@ -1214,10 +1310,11 @@ Examples:
 this macro is commonly abused by using quoted literals to retain
 white-space and align consecutive
 .Sx \&Cd
-declarations.  This practise is discouraged.
+declarations.
+This practise is discouraged.
 .Ss \&Cm
-Command modifiers.  Useful when specifying configuration options or
-keys.
+Command modifiers.
+Useful when specifying configuration options or keys.
 .Pp
 Examples:
 .D1 \&.Cm ControlPath
@@ -1226,8 +1323,10 @@ Examples:
 See also
 .Sx \&Fl .
 .Ss \&D1
-One-line indented display.  This is formatted by the default rules and
-is useful for simple indented statements.  It is followed by a newline.
+One-line indented display.
+This is formatted by the default rules and is useful for simple indented
+statements.
+It is followed by a newline.
 .Pp
 Examples:
 .D1 \&.D1 \&Fl abcdefgh
@@ -1242,9 +1341,11 @@ Closes a
 .Sx \&Do
 block.  Does not have any tail arguments.
 .Ss \&Dd
-Document date.  This is the mandatory first macro of any
+Document date.
+This is the mandatory first macro of any
 .Nm
-manual.  Its calling syntax is as follows:
+manual.
+Its calling syntax is as follows:
 .Pp
 .D1 \. Ns Sx \&Dd Cm date
 .Pp
@@ -1268,8 +1369,10 @@ See also
 and
 .Sx \&Os .
 .Ss \&Dl
-One-line intended display.  This is formatted as literal text and is
-useful for commands and invocations.  It is followed by a newline.
+One-line intended display.
+This is formatted as literal text and is useful for commands and
+invocations.
+It is followed by a newline.
 .Pp
 Examples:
 .D1 \&.Dl % mandoc mdoc.7 | less
@@ -1299,19 +1402,22 @@ Examples:
 See also
 .Sx \&Do .
 .Ss \&Dt
-Document title.  This is the mandatory second macro of any
+Document title.
+This is the mandatory second macro of any
 .Nm
-file.  Its calling syntax is as follows:
+file.
+Its calling syntax is as follows:
 .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).
+This should be capitalised and is required.
 .It Cm section
-The manual section.  This may be one of
+The manual section.
+This may be one of
 .Ar 1
 .Pq utilities ,
 .Ar 2
@@ -1377,10 +1483,13 @@ or
 .Ar CON
 .Pq contributed manuals .
 .It Cm arch
-This specifies a specific relevant architecture.  If
+This specifies a specific relevant architecture.
+If
 .Cm volume
 is not provided, it may be used in its place, else it may be used
-subsequent that.  It, too, is optional.  It must be one of
+subsequent that.
+It, too, is optional.
+It must be one of
 .Ar alpha ,
 .Ar amd64 ,
 .Ar amiga ,
@@ -1453,9 +1562,9 @@ and
 .Ss \&Ek
 .Ss \&El
 .Ss \&Em
-Denotes text that should be emphasised.  Note that this is a
-presentation term and should not be used for stylistically decorating
-technical terms.
+Denotes text that should be emphasised.
+Note that this is a presentation term and should not be used for
+stylistically decorating technical terms.
 .Pp
 Examples:
 .D1 \&.Em Warnings!
@@ -1480,8 +1589,8 @@ Examples:
 .D1 \&.Ev DISPLAY
 .D1 \&.Ev PATH
 .Ss \&Ex
-Inserts text regarding a utility's exit values.  This macro must have
-first the
+Inserts text regarding a utility's exit values.
+This macro must have first the
 .Fl std
 argument specified, then an optional
 .Ar utility .
@@ -1494,12 +1603,14 @@ is provided.
 .Ss \&Fc
 .Ss \&Fd
 .Ss \&Fl
-Command-line flag.  Used when listing arguments to command-line
-utilities.  Prints a fixed-width hyphen
+Command-line flag.
+Used when listing arguments to command-line utilities.
+Prints a fixed-width hyphen
 .Sq \-
-directly followed by each argument.  If no arguments are provided, a hyphen is
-printed followed by a space.  If the argument is a macro, a hyphen is
-prefixed to the subsequent macro output.
+directly followed by each argument.
+If no arguments are provided, a hyphen is printed followed by a space.
+If the argument is a macro, a hyphen is prefixed to the subsequent macro
+output.
 .Pp
 Examples:
 .D1 \&.Fl a b c
@@ -1535,9 +1646,32 @@ and
 .Ss \&In
 .Ss \&It
 .Ss \&Lb
+Specify a library.
+The calling syntax is as follows:
+.Pp
+.D1 \. Ns 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:
+Format a hyperlink.
+The calling syntax is as follows:
 .Pp
 .D1 \. Ns Sx \&Lk Cm uri Op Cm name
 .Pp
@@ -1575,7 +1709,8 @@ and
 .Ss \&Oo
 .Ss \&Op
 .Ss \&Os
-Document operating system version.  This is the mandatory third macro of
+Document operating system version.
+This is the mandatory third macro of
 any
 .Nm
 file.  Its calling syntax is as follows:
@@ -1584,9 +1719,9 @@ file.  Its calling syntax is as follows:
 .Pp
 The optional
 .Cm system
-parameter specifies the relevant operating system or environment.  Left
-unspecified, it defaults to the local operating system version.  This is
-the suggested form.
+parameter specifies the relevant operating system or environment.
+Left unspecified, it defaults to the local operating system version.
+This is the suggested form.
 .Pp
 Examples:
 .D1 \&.Os
@@ -1632,12 +1767,14 @@ and
 .Ss \&Re
 Closes a
 .Sx \&Rs
-block.  Does not have any tail arguments.
+block.
+Does not have any tail arguments.
 .Ss \&Rs
 Begins a bibliographic
 .Pq Dq reference
-block.  Does not have any head arguments.  The block macro may only
-contain
+block.
+Does not have any head arguments.
+The block macro may only contain
 .Sx \&%A ,
 .Sx \&%B ,
 .Sx \&%C ,
@@ -1683,8 +1820,11 @@ line.
 .Ss \&Sy
 .Ss \&Tn
 .Ss \&Ud
+Prints out
+.Dq currently under development.
 .Ss \&Ux
-Format the UNIX name.  Accepts no argument.
+Format the UNIX name.
+Accepts no argument.
 .Pp
 Examples:
 .D1 \&.Ux
@@ -1700,9 +1840,10 @@ and
 .Sx \&Ox .
 .Ss \&Va
 .Ss \&Vt
-A variable type.  This is also used for indicating global variables in the
-SYNOPSIS section, in which case a variable name is also specified.  Note that
-it accepts
+A variable type.
+This is also used for indicating global variables in the 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
@@ -1725,9 +1866,9 @@ and
 Close a scope opened by
 .Sx \&Xo .
 .Ss \&Xo
-Open an extension scope.  This macro originally existed to extend the
-9-argument limit of troff; since this limit has been lifted, the macro
-has been deprecated.
+Open an extension scope.
+This macro originally existed to extend the 9-argument limit of troff;
+since this limit has been lifted, the macro has been deprecated.
 .Ss \&Xr
 Link to another manual
 .Pq Qq cross-reference .
@@ -1739,12 +1880,13 @@ The
 .Cm name
 and
 .Cm section
-are the name and section of the linked manual.  If
+are the name and section of the linked manual.
+If
 .Cm section
 is followed by non-punctuation, an
 .Sx \&Ns
-is inserted into the token stream.  This behaviour is for compatibility
-with
+is inserted into the token stream.
+This behaviour is for compatibility with
 .Xr groff 1 .
 .Pp
 Examples:
@@ -1776,25 +1918,29 @@ is no longer accepted.
 In groff, the
 .Sx \&Pa
 macro does not format its arguments when used in the FILES section under
-certain list types.  mandoc does.
+certain list types.
+mandoc does.
 .It
 Historic groff does not print a dash for empty
 .Sx \&Fl
-arguments.  mandoc and newer groff implementations do.
+arguments.
+mandoc and newer groff implementations do.
 .It
 groff behaves irregularly when specifying
 .Sq \ef
 .Sx Text Decoration
-within line-macro scopes.  mandoc follows a consistent system.
+within line-macro scopes.
+mandoc follows a consistent system.
 .It
 In mandoc, negative scaling units are truncated to zero; groff would
-move to prior lines.  Furthermore, the
+move to prior lines.
+Furthermore, the
 .Sq f
 scaling unit, while accepted, is rendered as the default unit.
 .It
 In quoted literals, groff allowed pair-wise double-quotes to produce a
-standalone double-quote in formatted output.  This idiosyncratic
-behaviour is not applicable in mandoc.
+standalone double-quote in formatted output.
+This idiosyncratic behaviour is not applicable in mandoc.
 .It
 Display types
 .Sx \&Bd
@@ -1805,8 +1951,8 @@ are aliases for
 .Fl left
 in manodc.  Furthermore, the
 .Fl file Ar file
-argument is ignored.  Lastly, since text is not right-justified in
-mandoc (or even groff),
+argument is ignored.
+Lastly, since text is not right-justified in mandoc (or even groff),
 .Fl ragged
 and
 .Fl filled
@@ -1815,8 +1961,8 @@ are aliases, as are
 and
 .Fl unfilled .
 .It
-Historic groff has many un-callable macros.  Most of these (excluding
-some block-level macros) are now callable.
+Historic groff has many un-callable macros.
+Most of these (excluding some block-level macros) are now callable.
 .It
 The vertical bar
 .Sq \(ba
@@ -1833,20 +1979,28 @@ lists will restart the sequence only for the sub-list.
 Some manuals use
 .Sx \&Li
 incorrectly by following it with a reserved character and expecting the
-delimiter to render.  This is not supported in mandoc.
+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.
+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
-macros were stipulated only to occur in certain manual sections.  mandoc
-does not have these restrictions.
+.Sx \&Rv
+macros were stipulated only to occur in certain manual sections.
+mandoc does not have these restrictions.
+.It
+Newer groff and mandoc print
+.Qq AT&T UNIX
+prior to unknown arguments of
+.Sx \&At ;
+older groff did nothing.
 .El
 .Sh SEE ALSO
 .Xr mandoc 1 ,