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Diff for /mandoc/mdoc.7 between version 1.49 and 1.113

version 1.49, 2009/07/19 09:17:42 version 1.113, 2010/06/02 12:01:00
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 .\"     $Id$  .\"     $Id$
 .\"  .\"
 .\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@kth.se>  .\" Copyright (c) 2009 Kristaps Dzonsons <kristaps@bsd.lv>
 .\"  .\"
 .\" Permission to use, copy, modify, and distribute this software for any  .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above  .\" purpose with or without fee is hereby granted, provided that the above
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 .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN  .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"  .\"
 .Dd $Mdocdate$  .Dd $Mdocdate$
 .Dt MDOC 7  .Dt MDOC 7
 .Os  .Os
 .\" SECTION---------------------------------------------  
 .Sh NAME  .Sh NAME
 .Nm mdoc  .Nm mdoc
 .Nd mdoc language reference  .Nd mdoc language reference
 .\" SECTION---------------------------------------------  
 .Sh DESCRIPTION  .Sh DESCRIPTION
 The  The
 .Nm mdoc  .Nm mdoc
 language is used to format  language is used to format
 .Bx  .Bx
 .Ux  .Ux
 manuals.  In this reference document, we describe its syntax, structure,  manuals.  In this reference document, we describe its syntax, structure,
 and usage.  Our reference implementation is  and usage.  Our reference implementation is mandoc; the
 .Xr mandoc 1 .  
 The  
 .Sx COMPATIBILITY  .Sx COMPATIBILITY
 section describes compatibility with  section describes compatibility with other troff \-mdoc implementations.
 .Xr groff 1 .  
 .\" PARAGRAPH------------  
 .Pp  .Pp
 An  An
 .Nm  .Nm
 document follows simple rules:  lines beginning with the control  document follows simple rules:  lines beginning with the control
 character  character
 .Sq \.  .Sq \.
 are parsed for macros.  Other lines are interpreted within the scope of  are parsed for macros.  Other lines are interpreted within the scope of
 prior macros:  prior macros:
Line 48  prior macros:
Line 42  prior macros:
 \&.Sh Macro lines change control state.  \&.Sh Macro lines change control state.
 Other lines are interpreted within the current state.  Other lines are interpreted within the current state.
 .Ed  .Ed
 .\" SECTION---------------------------------------------  
 .Sh LANGUAGE SYNTAX  .Sh LANGUAGE SYNTAX
 .Nm  .Nm
 documents may contain only graphable 7-bit ASCII characters, the space  documents may contain only graphable 7-bit ASCII characters, the space
 character, and, in certain circumstances, the tab character.  All  character, and, in certain circumstances, the tab character.  All
 manuals must have  manuals must have
 .Ux  .Ux
 line terminators.  line terminators.
 .\" SUB-SECTION----------------------  
 .Ss Comments  .Ss Comments
 Text following a  Text following a
 .Sq \e" ,  .Sq \e" ,
 whether in a macro or free-form text line, is ignored to the end of  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,  line.  A macro line with only a control character and comment escape,
 .Sq \&.\e" ,  .Sq \&.\e" ,
 is also ignored.  is also ignored.  Macro lines with only a control charater and optionally
 .\" SUB-SECTION----------------------  whitespace are stripped from input.
 .Ss Reserved Characters  .Ss Reserved Characters
 Within a macro line, the following characters are reserved:  Within a macro line, the following characters are reserved:
   .Pp
 .Bl -tag -width Ds -offset indent -compact  .Bl -tag -width Ds -offset indent -compact
 .It \&.  .It \&.
 .Pq period  .Pq period
Line 87  Within a macro line, the following characters are rese
Line 80  Within a macro line, the following characters are rese
 .It \&?  .It \&?
 .Pq question  .Pq question
 .It \&!  .It \&!
 .Pq exclamation  .Pq exclamation
 .It \&|  .It \&|
 .Pq vertical bar  .Pq vertical bar
 .El  .El
 .\" PARAGRAPH------------  
 .Pp  .Pp
 Use of reserved characters is described in  Use of reserved characters is described in
 .Sx MACRO SYNTAX .  .Sx MACRO SYNTAX .
 For general use in macro lines, these characters must either be escaped  For general use in macro lines, these characters must either be escaped
 with a non-breaking space  with a non-breaking space
 .Pq Sq \e&  .Pq Sq \e&
 or, if applicable, an appropriate escape sequence used.  or, if applicable, an appropriate escape sequence used.
 .\" SUB-SECTION----------------------  
 .Ss Special Characters  .Ss Special Characters
 Special characters may occur in both macro and free-form lines.  Special characters may occur in both macro and free-form lines.
 Sequences begin with the escape character  Sequences begin with the escape character
 .Sq \e  .Sq \e
 followed by either an open-parenthesis  followed by either an open-parenthesis
 .Sq \&(  .Sq \&(
 for two-character sequences; an open-bracket  for two-character sequences; an open-bracket
 .Sq \&[  .Sq \&[
 for n-character sequences (terminated at a close-bracket  for n-character sequences (terminated at a close-bracket
 .Sq \&] ) ;  .Sq \&] ) ;
 or a single one-character sequence.  See  or a single one-character sequence.
 .Xr mandoc_char 1  See
 for a complete list.  Examples include  .Xr mandoc_char 7
 .Sq \e(em  for a complete list.
 .Pq em-dash  Examples include
 and  .Sq \e(em
   .Pq em-dash
   and
 .Sq \ee  .Sq \ee
 .Pq back-slash .  .Pq back-slash .
 .\" PARAGRAPH------------  .Ss Text Decoration
   Terms may be text-decorated using the
   .Sq \ef
   escape followed by an indicator: B (bold), I, (italic), R (Roman), or P
   (revert to previous mode):
 .Pp  .Pp
 An alternative escape sequence is  .D1 \efBbold\efR \efIitalic\efP
 the slash-asterisk,  
 .Sq \e* ,  
 but this method is discouraged for compatibility reasons.  
 .\" PARAGRAPH------------  
 .Pp  .Pp
 Terms may  A numerical representation 3, 2, or 1 (bold, italic, and Roman,
 also be text-decorated using the  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  .Sq \ef
 escape followed by an indicator: B (bold), I, (italic), or P and R  are only valid within the font scope of the macro.
 (Roman, or reset).  This form is not recommended.  If
 .\" SUB-SECTION----------------------  .Sq \ef
 .Ss Whitespace  is specified outside of any font scope, such as in unenclosed, free-form
 In non-literal free-form lines, consecutive blocks of whitespace are  text, it will affect the remainder of the document.
 pruned from input and added later in the output filter, if applicable:  
 .Bd -literal -offset indent  
 These     spaces   are    pruned       from    input.  
 \&.Bd \-literal  
 These         are              not.  
 \&.Ed  
 .Ed  
 .\" PARAGRAPH------------  
 .Pp  .Pp
 In macro lines, whitespace delimits arguments and is discarded.  If  Text may also be sized with the
 arguments are quoted, whitespace within the quotes is retained.  .Sq \es
 .\" PARAGRAPH------------  escape, whose syntax is one of
   .Sq \es+-n
   for one-digit numerals;
   .Sq \es(+-nn
   or
   .Sq \es+-(nn
   for two-digit numerals; and
   .Sq \es[+-N] ,
   .Sq \es+-[N] ,
   .Sq \es'+-N' ,
   or
   .Sq \es+-'N'
   for arbitrary-digit numerals:
 .Pp  .Pp
 Blank lines are only permitted within literal contexts, as are lines  .D1 \es+1bigger\es-1
 containing only whitespace.  Tab characters are only acceptable when  .D1 \es[+10]much bigger\es[-10]
 delimiting  .D1 \es+(10much bigger\es-(10
 .Sq \&Bl \-column  .D1 \es+'100'much much bigger\es-'100'
 or when in a literal context.  .Pp
 .\" SUB-SECTION----------------------  Note these forms are
   .Em not
   recommended for
   .Nm ,
   which encourages semantic annotation.
   .Ss Predefined Strings
   Historically,
   .Xr groff 1
   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.
   Predefined strings are escaped with the slash-asterisk,
   .Sq \e* :
   single-character
   .Sq \e*X ,
   two-character
   .Sq \e*(XX ,
   and N-character
   .Sq \e*[N] .
   See
   .Xr mandoc_char 7
   for a complete list.
   Examples include
   .Sq \e*(Am
   .Pq ampersand
   and
   .Sq \e*(Ba
   .Pq vertical bar .
   .Ss Whitespace
   Whitespace consists of the space character.
   In free-form lines, whitespace is preserved within a line; un-escaped
   trailing spaces are stripped from input (unless in a literal context).
   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.
 .Ss Quotation  .Ss Quotation
 Macro arguments may be quoted with a double-quote to group  Macro arguments may be quoted with a double-quote to group
 space-delimited terms or to retain blocks of whitespace.  A quoted  space-delimited terms or to retain blocks of whitespace.
 argument begins with a double-quote preceded by whitespace.  The next  A quoted argument begins with a double-quote preceded by whitespace.
 double-quote not pair-wise adjacent to another double-quote terminates  The next double-quote not pair-wise adjacent to another double-quote
 the literal, regardless of surrounding whitespace.  terminates the literal, regardless of surrounding whitespace.
 .\" PARAGRAPH------------  
 .Pp  .Pp
 This produces tokens  This produces tokens
 .Sq a" ,  .Sq a" ,
 .Sq b c ,  .Sq b c ,
 .Sq de ,  .Sq de ,
 and  and
 .Sq fg" .  .Sq fg" .
 Note that any quoted term, be it argument or macro, is indiscriminately  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 :  .Sq \&Em a :
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Em "Em a"  \&.Em "Em a"
 .Ed  .Ed
 .\" PARAGRAPH------------  
 .Pp  .Pp
 In free-form mode, quotes are regarded as opaque text.  In free-form mode, quotes are regarded as opaque text.
 .\" SECTION---------------------------------------------  .Ss Dates
   There are several macros in
   .Nm
   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
   .Cm Month
   value is the full month name.
   The
   .Cm Year
   value is the full four-digit year.
   .Pp
   Reduced form dates are broken-down canonical form dates:
   .Pp
   .D1 Cm Month , Year
   .D1 Cm Year
   .Pp
   Some examples of valid dates follow:
   .Pp
   .D1 "May, 2009" Pq reduced form
   .D1 "2009" Pq reduced form
   .D1 "May 20, 2009" Pq canonical form
   .Ss Scaling Widths
   Many macros support scaled widths for their arguments, such as
   stipulating a two-inch list indentation with the following:
   .Bd -literal -offset indent
   \&.Bl -tag -width 2i
   .Ed
   .Pp
   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:
   .Pp
   .Bl -tag -width Ds -offset indent -compact
   .It c
   centimetre
   .It i
   inch
   .It P
   pica (~1/6 inch)
   .It p
   point (~1/72 inch)
   .It f
   synonym for
   .Sq u
   .It v
   default vertical span
   .It m
   width of rendered
   .Sq m
   .Pq em
   character
   .It n
   width of rendered
   .Sq n
   .Pq en
   character
   .It u
   default horizontal span
   .It M
   mini-em (~1/100 em)
   .El
   .Pp
   Using anything other than
   .Sq m ,
   .Sq n ,
   .Sq u ,
   or
   .Sq v
   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  .Sh MANUAL STRUCTURE
 Each  A well-formed
 .Nm  .Nm
 document must begin with a document prologue, containing, in order,  document consists of a document prologue followed by one or more
 .Sq \&Dd ,  sections.
 .Sq \&Dt ,  .Pp
   The prologue, which consists of (in order) the
   .Sx \&Dd ,
   .Sx \&Dt ,
 and  and
 .Sq \&Os ,  .Sx \&Os
 then the NAME section containing at least one  macros, is required for every document.
 .Sq \&Nm  .Pp
 followed by  The first section (sections are denoted by
 .Sq \&Nd :  .Sx \&Sh )
   must be the NAME section, consisting of at least one
   .Sx \&Nm
   followed by
   .Sx \&Nd .
   .Pp
   Following that, convention dictates specifying at least the SYNOPSIS and
   DESCRIPTION sections, although this varies between manual sections.
   .Pp
   The following is a well-formed skeleton
   .Nm
   file:
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Dd $\&Mdocdate$  \&.Dd $\&Mdocdate$
 \&.Dt mdoc 7  \&.Dt mdoc 7
 \&.Os  \&.Os
 \&.Sh NAME  \&.Sh NAME
 \&.Nm mdoc  \&.Nm foo
 \&.Nd mdoc language reference  \&.Nd a description goes here
   \&.\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
   utility processes files ...
   \&.\e\*q .Sh IMPLEMENTATION NOTES
   \&.\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
   \&.\e\*q The next is for sections 2, 3, & 9 only.
   \&.\e\*q .Sh ERRORS
   \&.\e\*q .Sh SEE ALSO
   \&.\e\*q .Xr foobar 1
   \&.\e\*q .Sh STANDARDS
   \&.\e\*q .Sh HISTORY
   \&.\e\*q .Sh AUTHORS
   \&.\e\*q .Sh CAVEATS
   \&.\e\*q .Sh BUGS
   \&.\e\*q .Sh SECURITY CONSIDERATIONS
 .Ed  .Ed
 .\" PARAGRAPH------------  
 .Pp  .Pp
 Subsequent SYNOPSIS and DESCRIPTION sections are strongly encouraged,  The sections in a
 but non-compulsory.  .Nm
 .\" SECTION---------------------------------------------  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:
   .Bd -literal -offset indent
   \&.Nm name0
   \&.Nm name1
   \&.Nm name2
   \&.Nd a short description
   .Ed
   .Pp
   The
   .Sx \&Nm
   macro(s) must precede the
   .Sx \&Nd
   macro.
   .Pp
   See
   .Sx \&Nm
   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, 3, or 9 manual.
   The syntax for this is as follows:
   .Bd -literal -offset indent
   \&.Lb libarm
   .Ed
   .Pp
   See
   .Sx \&Lb .
   .It Em SYNOPSIS
   Documents the utility invocation syntax, function call syntax, or device
   configuration.
   .Pp
   For the first, utilities (sections 1, 6, and 8), this is
   generally structured as follows:
   .Bd -literal -offset indent
   \&.Nm foo
   \&.Op Fl v
   \&.Op Fl o Ar file
   \&.Op Ar
   \&.Nm bar
   \&.Op Fl v
   \&.Op Fl o Ar file
   \&.Op Ar
   .Ed
   .Pp
   For the second, function calls (sections 2, 3, 9):
   .Bd -literal -offset indent
   \&.Vt extern const char *global;
   \&.In header.h
   \&.Ft "char *"
   \&.Fn foo "const char *src"
   \&.Ft "char *"
   \&.Fn bar "const char *src"
   .Ed
   .Pp
   And for the third, configurations (section 4):
   .Bd -literal -offset indent
   \&.Cd \*qit* at isa? port 0x2e\*q
   \&.Cd \*qit* at isa? port 0x4e\*q
   .Ed
   .Pp
   Manuals not in these sections generally don't need a
   .Em SYNOPSIS .
   .Pp
   See
   .Sx \&Op ,
   .Sx \&Cd ,
   .Sx \&Fn ,
   .Sx \&Ft ,
   and
   .Sx \&Vt .
   .It Em DESCRIPTION
   This expands upon the brief, one-line description in
   .Em NAME .
   It usually contains a break-down of the options (if documenting a
   command), such as:
   .Bd -literal -offset indent
   The arguments are as follows:
   \&.Bl \-tag \-width Ds
   \&.It Fl v
   Print verbose information.
   \&.El
   .Ed
   .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 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.
   .Pp
   See
   .Sx \&Rv .
   .It Em ENVIRONMENT
   Documents any usages of environment variables, e.g.,
   .Xr environ 7 .
   .Pp
   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.).
   .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!
   .It Em DIAGNOSTICS
   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
   discouraged.
   .Pp
   See
   .Sx \&Bl
   .Fl diag .
   .It Em ERRORS
   Documents error handling in sections 2, 3, and 9.
   .Pp
   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.
   .Pp
   See
   .Sx \&Xr .
   .It Em STANDARDS
   References any standards implemented or used.
   If not adhering to any standards, the
   .Em HISTORY
   section should be used instead.
   .Pp
   See
   .Sx \&St .
   .It Em HISTORY
   The history of any manual without a
   .Em STANDARDS
   section should be described in this section.
   .It Em AUTHORS
   Credits to authors, if applicable, should appear in this section.
   Authors should generally be noted by both name and an e-mail address.
   .Pp
   See
   .Sx \&An .
   .It Em CAVEATS
   Explanations of common misuses and misunderstandings should be explained
   in this section.
   .It Em BUGS
   Extant bugs should be described in this section.
   .It Em SECURITY CONSIDERATIONS
   Documents any security precautions that operators should consider.
   .El
 .Sh MACRO SYNTAX  .Sh MACRO SYNTAX
 Every line beginning with the control character  Macros are one to three three characters in length and begin with a
 .Sq \.  control character ,
 is processed for macros, two- or three-character sequences.  .Sq \&. ,
 .\" PARAGRAPH------------  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  .Pp
 The syntax of a macro depends on its classification.  In this section,  The syntax of a macro depends on its classification.
 .Sq \-arg  In this section,
   .Sq \-arg
 refers to macro arguments, which may be followed by zero or more  refers to macro arguments, which may be followed by zero or more
 .Sq parm  .Sq parm
 parameters;  parameters;
Line 217  parameters;
Line 584  parameters;
 opens the scope of a macro; and if specified,  opens the scope of a macro; and if specified,
 .Sq \&Yc  .Sq \&Yc
 closes it out.  closes it out.
 .\" PARAGRAPH------------  
 .Pp  .Pp
 The  The
 .Em Callable  .Em Callable
 column indicates that the macro may be called subsequent to the initial  column indicates that the macro may be called subsequent to the initial
 line-macro.  The  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 .
   .Pp
   The
 .Em Parsable  .Em Parsable
 column indicates whether the macro may be followed by further  column indicates whether the macro may be followed by further
 (ostensibly callable) macros.  The  (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  .Em Scope
 column, if applicable, describes closure rules.  column, if applicable, describes closure rules.
 .\" SUB-SECTION----------------------  
 .Ss Block full-explicit  .Ss Block full-explicit
 Multi-line scope closed by an explicit closing macro.  All macros  Multi-line scope closed by an explicit closing macro.
 contains bodies; only  All macros contains bodies; only
 .Pq Sq \&Bf  .Sx \&Bf
 contains a head.  contains a head.
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB  \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB
 \(lBbody...\(rB  \(lBbody...\(rB
 \&.Yc  \&.Yc
 .Ed  .Ed
 .\" PARAGRAPH------------  
 .Pp  .Pp
 .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXX"  .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXX"
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope
 .It \&Bd     Ta    \&No     Ta    \&No     Ta    closed by \&Ed  .It Sx \&Bd  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Ed
 .It \&Bf     Ta    \&No     Ta    \&No     Ta    closed by \&Ef  .It Sx \&Bf  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Ef
 .It \&Bk     Ta    \&No     Ta    \&No     Ta    closed by \&Ek  .It Sx \&Bk  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Ek
 .It \&Bl     Ta    \&No     Ta    \&No     Ta    closed by \&El  .It Sx \&Bl  Ta    \&No     Ta    \&No     Ta    closed by Sx \&El
 .It \&Ed     Ta    \&No     Ta    \&No     Ta    opened by \&Bd  .It Sx \&Ed  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bd
 .It \&Ef     Ta    \&No     Ta    \&No     Ta    opened by \&Bf  .It Sx \&Ef  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bf
 .It \&Ek     Ta    \&No     Ta    \&No     Ta    opened by \&Bk  .It Sx \&Ek  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bk
 .It \&El     Ta    \&No     Ta    \&No     Ta    opened by \&Bl  .It Sx \&El  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Bl
 .El  .El
 .\" SUB-SECTION----------------------  
 .Ss Block full-implicit  .Ss Block full-implicit
 Multi-line scope closed by end-of-file or implicitly by another macro.  Multi-line scope closed by end-of-file or implicitly by another macro.
 All macros have bodies; some  All macros have bodies; some
 .Po  .Po
 .Sq \&It \-bullet ,  .Sx \&It Fl bullet ,
 .Sq \-hyphen ,  .Fl hyphen ,
 .Sq \-dash ,  .Fl dash ,
 .Sq \-enum ,  .Fl enum ,
 .Sq \-item  .Fl item
 .Pc  .Pc
 don't have heads, while  don't have heads; only one
 .Sq \&It \-column  .Po
 may have multiple heads.  .Sx \&It Fl column
   .Pc
   has multiple heads.
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead... \(lBTa head...\(rB\(rB  \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead... \(lBTa head...\(rB\(rB
 \(lBbody...\(rB  \(lBbody...\(rB
 .Ed  .Ed
 .\" PARAGRAPH------------  
 .Pp  .Pp
 .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXXXXXXXXXX"  .Bl -column -compact -offset indent "MacroX" "CallableX" "ParsableX" "closed by XXXXXXXXXXX"
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope
 .It \&It     Ta    \&No     Ta    Yes      Ta    closed by \&It, \&El  .It Sx \&It  Ta    \&No     Ta    Yes      Ta    closed by Sx \&It , Sx \&El
 .It \&Nd     Ta    \&No     Ta    \&No     Ta    closed by \&Sh  .It Sx \&Nd  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh
 .It \&Sh     Ta    \&No     Ta    \&No     Ta    closed by \&Sh  .It Sx \&Sh  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh
 .It \&Ss     Ta    \&No     Ta    \&No     Ta    closed by \&Sh, \&Ss  .It Sx \&Ss  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Sh , Sx \&Ss
 .El  .El
 .\" SUB-SECTION----------------------  
 .Ss Block partial-explicit  .Ss Block partial-explicit
 Like block full-explicit, but also with single-line scope.  Each  Like block full-explicit, but also with single-line scope.
 has at least a body and, in limited circumstances, a head  Each has at least a body and, in limited circumstances, a head
 .Pq So \&Fo Sc , So \&Eo Sc  .Po
 and/or tail  .Sx \&Fo ,
 .Pq So \&Ec Sc .  .Sx \&Eo
   .Pc
   and/or tail
   .Pq Sx \&Ec .
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB  \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB
 \(lBbody...\(rB  \(lBbody...\(rB
 \&.Yc \(lBtail...\(rB  \&.Yc \(lBtail...\(rB
   
 \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB \  \&.Yo \(lB\-arg \(lBparm...\(rB\(rB \(lBhead...\(rB \
 \(lBbody...\(rB \&Yc \(lBtail...\(rB  \(lBbody...\(rB \&Yc \(lBtail...\(rB
 .Ed  .Ed
 .\" PARAGRAPH------------  
 .Pp  .Pp
 .Bl -column "MacroX" "CallableX" "ParsableX" "closed by XXXX" -compact -offset indent  .Bl -column "MacroX" "CallableX" "ParsableX" "closed by XXXX" -compact -offset indent
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope
 .It \&Ac     Ta    Yes      Ta    Yes      Ta    opened by \&Ao  .It Sx \&Ac  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Ao
 .It \&Ao     Ta    Yes      Ta    Yes      Ta    closed by \&Ac  .It Sx \&Ao  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Ac
 .It \&Bc     Ta    Yes      Ta    Yes      Ta    closed by \&Bo  .It Sx \&Bc  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Bo
 .It \&Bo     Ta    Yes      Ta    Yes      Ta    opened by \&Bc  .It Sx \&Bo  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Bc
 .It \&Brc    Ta    Yes      Ta    Yes      Ta    opened by \&Bro  .It Sx \&Brc Ta    Yes      Ta    Yes      Ta    opened by Sx \&Bro
 .It \&Bro    Ta    Yes      Ta    Yes      Ta    closed by \&Brc  .It Sx \&Bro Ta    Yes      Ta    Yes      Ta    closed by Sx \&Brc
 .It \&Dc     Ta    Yes      Ta    Yes      Ta    opened by \&Do  .It Sx \&Dc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Do
 .It \&Do     Ta    Yes      Ta    Yes      Ta    closed by \&Dc  .It Sx \&Do  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Dc
 .It \&Ec     Ta    Yes      Ta    Yes      Ta    opened by \&Eo  .It Sx \&Ec  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Eo
 .It \&Eo     Ta    Yes      Ta    Yes      Ta    closed by \&Ec  .It Sx \&Eo  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Ec
 .It \&Fc     Ta    Yes      Ta    Yes      Ta    opened by \&Fo  .It Sx \&Fc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Fo
 .It \&Fo     Ta    \&No     Ta    \&No     Ta    closed by \&Fc  .It Sx \&Fo  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Fc
 .It \&Oc     Ta    Yes      Ta    Yes      Ta    closed by \&Oo  .It Sx \&Oc  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Oo
 .It \&Oo     Ta    Yes      Ta    Yes      Ta    opened by \&Oc  .It Sx \&Oo  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Oc
 .It \&Pc     Ta    Yes      Ta    Yes      Ta    closed by \&Po  .It Sx \&Pc  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Po
 .It \&Po     Ta    Yes      Ta    Yes      Ta    opened by \&Pc  .It Sx \&Po  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Pc
 .It \&Qc     Ta    Yes      Ta    Yes      Ta    opened by \&Oo  .It Sx \&Qc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Oo
 .It \&Qo     Ta    Yes      Ta    Yes      Ta    closed by \&Oc  .It Sx \&Qo  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Oc
 .It \&Re     Ta    \&No     Ta    \&No     Ta    opened by \&Rs  .It Sx \&Re  Ta    \&No     Ta    \&No     Ta    opened by Sx \&Rs
 .It \&Rs     Ta    \&No     Ta    \&No     Ta    closed by \&Re  .It Sx \&Rs  Ta    \&No     Ta    \&No     Ta    closed by Sx \&Re
 .It \&Sc     Ta    Yes      Ta    Yes      Ta    opened by \&So  .It Sx \&Sc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&So
 .It \&So     Ta    Yes      Ta    Yes      Ta    closed by \&Sc  .It Sx \&So  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Sc
 .It \&Xc     Ta    Yes      Ta    Yes      Ta    opened by \&Xo  .It Sx \&Xc  Ta    Yes      Ta    Yes      Ta    opened by Sx \&Xo
 .It \&Xo     Ta    Yes      Ta    Yes      Ta    closed by \&Xc  .It Sx \&Xo  Ta    Yes      Ta    Yes      Ta    closed by Sx \&Xc
 .El  .El
 .\" SUB-SECTION----------------------  
 .Ss Block partial-implicit  .Ss Block partial-implicit
 Like block full-implicit, but with single-line scope closed by  Like block full-implicit, but with single-line scope closed by
 .Sx Reserved Characters  .Sx Reserved Characters
 or end of line.  or end of line.
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBbody...\(rB \(lBres...\(rB  \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBbody...\(rB \(lBres...\(rB
 .Ed  .Ed
 .\" PARAGRAPH------------  
 .Pp  .Pp
 .Bl -column "MacroX" "CallableX" "ParsableX" -compact -offset indent  .Bl -column "MacroX" "CallableX" "ParsableX" -compact -offset indent
 .It Em Macro Ta Em Callable Ta Em Parsable  .It Em Macro Ta Em Callable Ta Em Parsable
 .It \&Aq     Ta    Yes      Ta    Yes  .It Sx \&Aq  Ta    Yes      Ta    Yes
 .It \&Bq     Ta    Yes      Ta    Yes  .It Sx \&Bq  Ta    Yes      Ta    Yes
 .It \&Brq    Ta    Yes      Ta    Yes  .It Sx \&Brq Ta    Yes      Ta    Yes
 .It \&D1     Ta    \&No     Ta    \&Yes  .It Sx \&D1  Ta    \&No     Ta    \&Yes
 .It \&Dl     Ta    \&No     Ta    Yes  .It Sx \&Dl  Ta    \&No     Ta    Yes
 .It \&Dq     Ta    Yes      Ta    Yes  .It Sx \&Dq  Ta    Yes      Ta    Yes
 .It \&Op     Ta    Yes      Ta    Yes  .It Sx \&Op  Ta    Yes      Ta    Yes
 .It \&Pq     Ta    Yes      Ta    Yes  .It Sx \&Pq  Ta    Yes      Ta    Yes
 .It \&Ql     Ta    Yes      Ta    Yes  .It Sx \&Ql  Ta    Yes      Ta    Yes
 .It \&Qq     Ta    Yes      Ta    Yes  .It Sx \&Qq  Ta    Yes      Ta    Yes
 .It \&Sq     Ta    Yes      Ta    Yes  .It Sx \&Sq  Ta    Yes      Ta    Yes
   .It Sx \&Vt  Ta    Yes      Ta    Yes
 .El  .El
 .\" SUB-SECTION----------------------  .Pp
   Note that the
   .Sx \&Vt
   macro is a
   .Sx Block partial-implicit
   only when invoked as the first macro
   in a
   .Em SYNOPSIS
   section line, else it is
   .Sx In-line .
 .Ss In-line  .Ss In-line
 Closed by  Closed by
 .Sx Reserved Characters ,  .Sx Reserved Characters ,
 end of line, fixed argument lengths, and/or subsequent macros.  In-line  end of line, fixed argument lengths, and/or subsequent macros.
 macros have only text children.  If a number (or inequality) of  In-line macros have only text children.
 arguments is  If a number (or inequality) of arguments is
 .Pq n ,  .Pq n ,
 then the macro accepts an arbitrary number of arguments.  then the macro accepts an arbitrary number of arguments.
 .Bd -literal -offset indent  .Bd -literal -offset indent
 \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBargs...\(rB \(lbres...\(rb  \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBargs...\(rB \(lbres...\(rb
Line 363  then the macro accepts an arbitrary number of argument
Line 747  then the macro accepts an arbitrary number of argument
   
 \&.Yo \(lB\-arg \(lBval...\(rB\(rB arg0 arg1 argN  \&.Yo \(lB\-arg \(lBval...\(rB\(rB arg0 arg1 argN
 .Ed  .Ed
 .\" PARAGRAPH------------  
 .Pp  .Pp
 .Bl -column "MacroX" "CallableX" "ParsableX" "Arguments" -compact -offset indent  .Bl -column "MacroX" "CallableX" "ParsableX" "Arguments" -compact -offset indent
 .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Arguments  .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Arguments
 .It \&%A     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%A  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%B     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%B  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%C     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%C  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%D     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%D  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%I     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%I  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%J     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%J  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%N     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%N  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%O     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%O  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%P     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%P  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%R     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%Q  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%T     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%R  Ta    \&No     Ta    \&No     Ta    >0
 .It \&%V     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&%T  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Ad     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&%U  Ta    \&No     Ta    \&No     Ta    >0
 .It \&An     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&%V  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Ap     Ta    Yes      Ta    Yes      Ta    0  .It Sx \&Ad  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ar     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&An  Ta    Yes      Ta    Yes      Ta    n
 .It \&At     Ta    Yes      Ta    Yes      Ta    1  .It Sx \&Ap  Ta    Yes      Ta    Yes      Ta    0
 .It \&Bsx    Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ar  Ta    Yes      Ta    Yes      Ta    n
 .It \&Bt     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&At  Ta    Yes      Ta    Yes      Ta    1
 .It \&Bx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Bsx Ta    Yes      Ta    Yes      Ta    n
 .It \&Cd     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Bt  Ta    \&No     Ta    \&No     Ta    0
 .It \&Cm     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Bx  Ta    Yes      Ta    Yes      Ta    n
 .It \&Db     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Cd  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Dd     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&Cm  Ta    Yes      Ta    Yes      Ta    n
 .It \&Dt     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Db  Ta    \&No     Ta    \&No     Ta    1
 .It \&Dv     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Dd  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Dx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Dt  Ta    \&No     Ta    \&No     Ta    n
 .It \&Em     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Dv  Ta    Yes      Ta    Yes      Ta    n
 .It \&En     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Dx  Ta    Yes      Ta    Yes      Ta    n
 .It \&Er     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Em  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Es     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&En  Ta    \&No     Ta    \&No     Ta    0
 .It \&Ev     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Er  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ex     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Es  Ta    \&No     Ta    \&No     Ta    0
 .It \&Fa     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ev  Ta    Yes      Ta    Yes      Ta    n
 .It \&Fd     Ta    \&No     Ta    \&No     Ta    >0  .It Sx \&Ex  Ta    \&No     Ta    \&No     Ta    n
 .It \&Fl     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Fa  Ta    Yes      Ta    Yes      Ta    n
 .It \&Fn     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Fd  Ta    \&No     Ta    \&No     Ta    >0
 .It \&Fr     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Fl  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ft     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Fn  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Fx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Fr  Ta    \&No     Ta    \&No     Ta    n
 .It \&Hf     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Ft  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ic     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Fx  Ta    Yes      Ta    Yes      Ta    n
 .It \&In     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Hf  Ta    \&No     Ta    \&No     Ta    n
 .It \&Lb     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Ic  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Li     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&In  Ta    \&No     Ta    \&No     Ta    n
 .It \&Lk     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Lb  Ta    \&No     Ta    \&No     Ta    1
 .It \&Lp     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Li  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ms     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Lk  Ta    Yes      Ta    Yes      Ta    n
 .It \&Mt     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Lp  Ta    \&No     Ta    \&No     Ta    0
 .It \&Nm     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ms  Ta    Yes      Ta    Yes      Ta    >0
 .It \&No     Ta    Yes      Ta    Yes      Ta    0  .It Sx \&Mt  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ns     Ta    Yes      Ta    Yes      Ta    0  .It Sx \&Nm  Ta    Yes      Ta    Yes      Ta    n
 .It \&Nx     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&No  Ta    Yes      Ta    Yes      Ta    0
 .It \&Os     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Ns  Ta    Yes      Ta    Yes      Ta    0
 .It \&Ot     Ta    \&No     Ta    \&No     Ta    n  .It Sx \&Nx  Ta    Yes      Ta    Yes      Ta    n
 .It \&Ox     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Os  Ta    \&No     Ta    \&No     Ta    n
 .It \&Pa     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ot  Ta    \&No     Ta    \&No     Ta    n
 .It \&Pf     Ta    \&No     Ta    Yes      Ta    1  .It Sx \&Ox  Ta    Yes      Ta    Yes      Ta    n
 .It \&Pp     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Pa  Ta    Yes      Ta    Yes      Ta    n
 .It \&Rv     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Pf  Ta    Yes      Ta    Yes      Ta    1
 .It \&Sm     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Pp  Ta    \&No     Ta    \&No     Ta    0
 .It \&St     Ta    \&No     Ta    Yes      Ta    1  .It Sx \&Rv  Ta    \&No     Ta    \&No     Ta    n
 .It \&Sx     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Sm  Ta    \&No     Ta    \&No     Ta    1
 .It \&Sy     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&St  Ta    \&No     Ta    Yes      Ta    1
 .It \&Tn     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Sx  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ud     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Sy  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Ux     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Tn  Ta    Yes      Ta    Yes      Ta    >0
 .It \&Va     Ta    Yes      Ta    Yes      Ta    n  .It Sx \&Ud  Ta    \&No     Ta    \&No     Ta    0
 .It \&Vt     Ta    Yes      Ta    Yes      Ta    >0  .It Sx \&Ux  Ta    Yes      Ta    Yes      Ta    n
 .It \&Xr     Ta    Yes      Ta    Yes      Ta    >0, <3  .It Sx \&Va  Ta    Yes      Ta    Yes      Ta    n
 .It \&br     Ta    \&No     Ta    \&No     Ta    0  .It Sx \&Vt  Ta    Yes      Ta    Yes      Ta    >0
 .It \&sp     Ta    \&No     Ta    \&No     Ta    1  .It Sx \&Xr  Ta    Yes      Ta    Yes      Ta    >0
   .It Sx \&br  Ta    \&No     Ta    \&No     Ta    0
   .It Sx \&sp  Ta    \&No     Ta    \&No     Ta    1
 .El  .El
 .\" SECTION---------------------------------------------  .Sh REFERENCE
 .Sh COMPATIBILITY  This section is a canonical reference of all macros, arranged
 This section documents compatibility with other roff implementations, at  alphabetically.
 this time limited to  For the scoping of individual macros, see
   .Sx MACRO SYNTAX .
   .Ss \&%A
   Author name of an
   .Sx \&Rs
   block.  Multiple authors should each be accorded their own
   .Sx \%%A
   line.  Author names should be ordered with full or abbreviated
   forename(s) first, then full surname.
   .Ss \&%B
   Book title of an
   .Sx \&Rs
   block.  This macro may also be used in a non-bibliographic context when
   referring to book titles.
   .Ss \&%C
   Publication city or location of an
   .Sx \&Rs
   block.
   .Pp
   .Em Remarks :
   this macro is not implemented in
 .Xr groff 1 .  .Xr groff 1 .
 The term  .Ss \&%D
   Publication date of an
   .Sx \&Rs
   block.  This should follow the reduced or canonical form syntax
   described in
   .Sx Dates .
   .Ss \&%I
   Publisher or issuer name of an
   .Sx \&Rs
   block.
   .Ss \&%J
   Journal name of an
   .Sx \&Rs
   block.
   .Ss \&%N
   Issue number (usually for journals) of an
   .Sx \&Rs
   block.
   .Ss \&%O
   Optional information of an
   .Sx \&Rs
   block.
   .Ss \&%P
   Book or journal page number of an
   .Sx \&Rs
   block.
   .Ss \&%Q
   Institutional author (school, government, etc.) of an
   .Sx \&Rs
   block.  Multiple institutional authors should each be accorded their own
   .Sx \&%Q
   line.
   .Ss \&%R
   Technical report name of an
   .Sx \&Rs
   block.
   .Ss \&%T
   Article title of an
   .Sx \&Rs
   block.  This macro may also be used in a non-bibliographical context
   when referring to article titles.
   .Ss \&%U
   URI of reference document.
   .Ss \&%V
   Volume number of an
   .Sx \&Rs
   block.
   .Ss \&Ac
   Closes an
   .Sx \&Ao
   block.  Does not have any tail arguments.
   .Ss \&Ad
   Address construct: usually in the context of an computational address in
   memory, not a physical (post) address.
   .Pp
   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:
   .Bl -tag -width 12n -offset indent
   .It Fl split
   Renders a line break before each author listing.
   .It Fl nosplit
   The opposite of
   .Fl split .
   .El
   .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
   .Fl 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
   .D1 \&.An J. D. Ullman .
   .Pp
   .Em Remarks :
   the effects of
   .Fl split
   or
   .Fl nosplit
   are re-set when entering the AUTHORS section, so if one specifies
   .Sx \&An Fl nosplit
   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.
   .Pp
   Examples:
   .D1 \&.Fl -key= \&Ns \&Ao \&Ar val \&Ac
   .Pp
   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:
   .Bd -literal -offset indent
   \&.Fn execve Ap d
   .Ed
   .Ss \&Aq
   Encloses its arguments in angled brackets.
   .Pp
   Examples:
   .D1 \&.Fl -key= \&Ns \&Aq \&Ar val
   .Pp
   .Em Remarks :
   this macro is often abused for rendering URIs, which should instead use
   .Sx \&Lk
   or
   .Sx \&Mt ,
   or to note pre-processor
   .Dq Li #include
   statements, which should use
   .Sx \&In .
   .Pp
   See also
   .Sx \&Ao .
   .Ss \&Ar
   Command arguments.
   If an argument is not provided, the string
   .Dq file ...
   is used as a default.
   .Pp
   Examples:
   .D1 \&.Fl o \&Ns \&Ar file1
   .D1 \&.Ar
   .D1 \&.Ar arg1 , arg2 .
   .Ss \&At
   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
   .At .
   .It Cm V[.[1-4]]?
   A system version of
   .At .
   .El
   .Pp
   Note that these parameters do not begin with a hyphen.
   .Pp
   Examples:
   .D1 \&.At
   .D1 \&.At V.1
   .Pp
   See also
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .Ss \&Bc
   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.
   .Pp
   Each display is associated with a type, which must be one of the
   following arguments:
   .Bl -tag -width 12n -offset indent
   .It Fl ragged
   Only left-justify the block.
   .It Fl unfilled
   Do not justify the block at all.
   .It Fl filled
   Left- and right-justify the block.
   .It Fl literal
   Alias for
   .Fl unfilled .
   .It Fl centered
   Centre-justify each line.
   .El
   .Pp
   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
   .Ar width ,
   which is interpreted as one of the following, specified in order:
   .Bl -item
   .It
   As one of the pre-defined strings
   .Ar indent ,
   the width of standard indentation;
   .Ar indent-two ,
   twice
   .Ar indent ;
   .Ar left ,
   which has no effect ;
   .Ar right ,
   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
   .Ar \&Ds ,
   which resolves to
   .Ar 6n .
   .It
   As a scaling unit following the syntax described in
   .Sx Scaling Widths .
   .It
   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 .
   .It Fl compact
   Do not assert a vertical space before the block.
   .It Fl file Ar file
   Prepend the file
   .Ar file
   before any text or macros within the block.
   .El
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bd \-unfilled \-offset two-indent \-compact
      Hello       world.
   \&.Ed
   .Ed
   .Pp
   See also
   .Sx \&D1
   and
   .Sx \&Dl .
   .Ss \&Bf
   .Ss \&Bk
   .Ss \&Bl
   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.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bo 1 ,
   \&.Dv BUFSIZ \&Bc
   .Ed
   .Pp
   See also
   .Sx \&Bq .
   .Ss \&Bq
   Encloses its arguments in square brackets.
   .Pp
   Examples:
   .D1 \&.Bq 1 , \&Dv BUFSIZ
   .Pp
   .Em Remarks :
   this macro is sometimes abused to emulate optional arguments for
   commands; the correct macros to use for this purpose are
   .Sx \&Op ,
   .Sx \&Oo ,
   and
   .Sx \&Oc .
   .Pp
   See also
   .Sx \&Bo .
   .Ss \&Brc
   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.
   .Pp
   Examples:
   .Bd -literal -offset indent
   \&.Bro 1 , ... ,
   \&.Va n \&Brc
   .Ed
   .Pp
   See also
   .Sx \&Brq .
   .Ss \&Brq
   Encloses its arguments in curly braces.
   .Pp
   Examples:
   .D1 \&.Brq 1 , ... , \&Va n
   .Pp
   See also
   .Sx \&Bro .
   .Ss \&Bsx
   Format the BSD/OS version provided as an argument, or a default value if
   no argument is provided.
   .Pp
   Examples:
   .D1 \&.Bsx 1.0
   .D1 \&.Bsx
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .Ss \&Bt
   Prints
   .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:
   .D1 \&.Bx 4.4
   .D1 \&.Bx
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .Ss \&Cd
   Configuration declaration.
   This denotes strings accepted by
   .Xr config 8 .
   .Pp
   Examples:
   .D1 \&.Cd device le0 at scode?
   .Pp
   .Em Remarks :
   this macro is commonly abused by using quoted literals to retain
   white-space and align consecutive
   .Sx \&Cd
   declarations.
   This practise is discouraged.
   .Ss \&Cm
   Command modifiers.
   Useful when specifying configuration options or keys.
   .Pp
   Examples:
   .D1 \&.Cm ControlPath
   .D1 \&.Cm ControlMaster
   .Pp
   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.
   .Pp
   Examples:
   .D1 \&.D1 \&Fl abcdefgh
   .Pp
   See also
   .Sx \&Bd
   and
   .Sx \&Dl .
   .Ss \&Db
   .Ss \&Dc
   Closes a
   .Sx \&Do
   block.  Does not have any tail arguments.
   .Ss \&Dd
   Document date.
   This is the mandatory first macro of any
   .Nm
   manual.
   Its calling syntax is as follows:
   .Pp
   .D1 \. Ns Sx \&Dd Cm date
   .Pp
   The
   .Cm date
   field may be either
   .Ar $\&Mdocdate$ ,
   which signifies the current manual revision date dictated by
   .Xr cvs 1 ,
   or instead a valid canonical date as specified by
   .Sx Dates .
   If a date does not conform, the current date is used instead.
   .Pp
   Examples:
   .D1 \&.Dd $\&Mdocdate$
   .D1 \&.Dd $\&Mdocdate: July 21 2007$
   .D1 \&.Dd July 21, 2007
   .Pp
   See also
   .Sx \&Dt
   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.
   .Pp
   Examples:
   .D1 \&.Dl % mandoc mdoc.7 | less
   .Pp
   See also
   .Sx \&Bd
   and
   .Sx \&D1 .
   .Ss \&Do
   Begins a block enclosed by double quotes.  Does not have any head
   arguments.
   .Pp
   Examples:
   .D1 \&.D1 \&Do April is the cruellest month \&Dc \e(em T.S. Eliot
   .Pp
   See also
   .Sx \&Dq .
   .Ss \&Dq
   Encloses its arguments in double quotes.
   .Pp
   Examples:
   .Bd -literal -offset indent -compact
   \&.Dq April is the cruellest month
   \e(em T.S. Eliot
   .Ed
   .Pp
   See also
   .Sx \&Do .
   .Ss \&Dt
   Document title.
   This is the mandatory second macro of any
   .Nm
   file.
   Its calling syntax is as follows:
   .Pp
   .D1 \. Ns Sx \&Dt Op Cm title Op Cm 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), defaulting to
   .Qq UNKNOWN
   if unspecified.
   It should be capitalised.
   .It Cm section
   The manual section.
   This may be one of
   .Ar 1
   .Pq utilities ,
   .Ar 2
   .Pq system calls ,
   .Ar 3
   .Pq libraries ,
   .Ar 3p
   .Pq Perl libraries ,
   .Ar 4
   .Pq devices ,
   .Ar 5
   .Pq file formats ,
   .Ar 6
   .Pq games ,
   .Ar 7
   .Pq miscellaneous ,
   .Ar 8
   .Pq system utilities ,
   .Ar 9
   .Pq kernel functions ,
   .Ar X11
   .Pq X Window System ,
   .Ar X11R6
   .Pq X Window System ,
   .Ar unass
   .Pq unassociated ,
   .Ar local
   .Pq local system ,
   .Ar draft
   .Pq draft manual ,
   or
   .Ar paper
   .Pq paper .
   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 .
   This field is optional, and if specified, must be one of
   .Ar USD
   .Pq users' supplementary documents ,
   .Ar PS1
   .Pq programmers' supplementary documents ,
   .Ar AMD
   .Pq administrators' supplementary documents ,
   .Ar SMM
   .Pq system managers' manuals ,
   .Ar URM
   .Pq users' reference manuals ,
   .Ar PRM
   .Pq programmers' reference manuals ,
   .Ar KM
   .Pq kernel manuals ,
   .Ar IND
   .Pq master index ,
   .Ar MMI
   .Pq master index ,
   .Ar LOCAL
   .Pq local manuals ,
   .Ar LOC
   .Pq local manuals ,
   or
   .Ar CON
   .Pq contributed manuals .
   .It Cm arch
   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
   .Ar alpha ,
   .Ar amd64 ,
   .Ar amiga ,
   .Ar arc ,
   .Ar arm ,
   .Ar armish ,
   .Ar aviion ,
   .Ar hp300 ,
   .Ar hppa ,
   .Ar hppa64 ,
   .Ar i386 ,
   .Ar landisk ,
   .Ar loongson ,
   .Ar luna88k ,
   .Ar mac68k ,
   .Ar macppc ,
   .Ar mvme68k ,
   .Ar mvme88k ,
   .Ar mvmeppc ,
   .Ar pmax ,
   .Ar sgi ,
   .Ar socppc ,
   .Ar sparc ,
   .Ar sparc64 ,
   .Ar sun3 ,
   .Ar vax ,
   or
   .Ar zaurus .
   .El
   .Pp
   Examples:
   .D1 \&.Dt FOO 1
   .D1 \&.Dt FOO 4 KM
   .D1 \&.Dt FOO 9 i386
   .Pp
   See also
   .Sx \&Dd
   and
   .Sx \&Os .
   .Ss \&Dv
   Defined variables such as preprocessor constants.
   .Pp
   Examples:
   .D1 \&.Dv BUFSIZ
   .D1 \&.Dv STDOUT_FILENO
   .Pp
   See also
   .Sx \&Er .
   .Ss \&Dx
   Format the DragonFly BSD version provided as an argument, or a default
   value if no argument is provided.
   .Pp
   Examples:
   .D1 \&.Dx 2.4.1
   .D1 \&.Dx
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .Ss \&Ec
   .Ss \&Ed
   .Ss \&Ef
   .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.
   .Pp
   Examples:
   .D1 \&.Em Warnings!
   .D1 \&.Em Remarks :
   .Ss \&En
   .Ss \&Eo
   .Ss \&Er
   Display error constants.
   .Pp
   Examples:
   .D1 \&.Er EPERM
   .D1 \&.Er ENOENT
   .Pp
   See also
   .Sx \&Dv .
   .Ss \&Es
   .Ss \&Ev
   Environmental variables such as those specified in
   .Xr environ 7 .
   .Pp
   Examples:
   .D1 \&.Ev DISPLAY
   .D1 \&.Ev PATH
   .Ss \&Ex
   Inserts text regarding a utility's exit values.
   This macro must have first the
   .Fl std
   argument specified, then an optional
   .Ar utility .
   If
   .Ar utility
   is not provided, the document's name as stipulated in
   .Sx \&Nm
   is provided.
   .Ss \&Fa
   .Ss \&Fc
   .Ss \&Fd
   .Ss \&Fl
   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.
   .Pp
   Examples:
   .D1 \&.Fl a b c
   .D1 \&.Fl \&Pf a b
   .D1 \&.Fl
   .D1 \&.Op \&Fl o \&Ns \&Ar file
   .Pp
   See also
   .Sx \&Cm .
   .Ss \&Fn
   .Ss \&Fo
   .Ss \&Fr
   .Ss \&Ft
   .Ss \&Fx
   Format the FreeBSD version provided as an argument, or a default value
   if no argument is provided.
   .Pp
   Examples:
   .D1 \&.Fx 7.1
   .D1 \&.Fx
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Nx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .Ss \&Hf
   .Ss \&Ic
   .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:
   .Pp
   .D1 \. Ns Sx \&Lk Cm uri Op Cm name
   .Pp
   Examples:
   .D1 \&.Lk http://bsd.lv "The BSD.lv Project"
   .D1 \&.Lk http://bsd.lv
   .Pp
   See also
   .Sx \&Mt .
   .Ss \&Lp
   .Ss \&Ms
   .Ss \&Mt
   .Ss \&Nd
   .Ss \&Nm
   .Ss \&No
   .Ss \&Ns
   .Ss \&Nx
   Format the NetBSD version provided as an argument, or a default value if
   no argument is provided.
   .Pp
   Examples:
   .D1 \&.Nx 5.01
   .D1 \&.Nx
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Ox ,
   and
   .Sx \&Ux .
   .Ss \&Oc
   .Ss \&Oo
   .Ss \&Op
   .Ss \&Os
   Document operating system version.
   This is the mandatory third macro of
   any
   .Nm
   file.  Its calling syntax is as follows:
   .Pp
   .D1 \. Ns Sx \&Os Op Cm system
   .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.
   .Pp
   Examples:
   .D1 \&.Os
   .D1 \&.Os KTH/CSC/TCS
   .D1 \&.Os BSD 4.3
   .Pp
   See also
   .Sx \&Dd
   and
   .Sx \&Dt .
   .Ss \&Ot
   Unknown usage.
   .Pp
   .Em Remarks :
   this macro has been deprecated.
   .Ss \&Ox
   Format the OpenBSD version provided as an argument, or a default value
   if no argument is provided.
   .Pp
   Examples:
   .D1 \&.Ox 4.5
   .D1 \&.Ox
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   and
   .Sx \&Ux .
   .Ss \&Pa
   .Ss \&Pc
   .Ss \&Pf
   .Ss \&Po
   .Ss \&Pp
   .Ss \&Pq
   .Ss \&Qc
   .Ss \&Ql
   .Ss \&Qo
   .Ss \&Qq
   .Ss \&Re
   Closes a
   .Sx \&Rs
   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
   .Sx \&%A ,
   .Sx \&%B ,
   .Sx \&%C ,
   .Sx \&%D ,
   .Sx \&%I ,
   .Sx \&%J ,
   .Sx \&%N ,
   .Sx \&%O ,
   .Sx \&%P ,
   .Sx \&%Q ,
   .Sx \&%R ,
   .Sx \&%T ,
   and
   .Sx \&%V
   child macros (at least one must be specified).
   .Pp
   Examples:
   .Bd -literal -offset indent -compact
   \&.Rs
   \&.%A J. E. Hopcroft
   \&.%A J. D. Ullman
   \&.%B Introduction to Automata Theory, Languages, and Computation
   \&.%I Addison-Wesley
   \&.%C Reading, Massachusettes
   \&.%D 1979
   \&.Re
   .Ed
   .Pp
   If an
   .Sx \&Rs
   block is used within a SEE ALSO section, a vertical space is asserted
   before the rendered output, else the block continues on the current
   line.
   .Ss \&Rv
   .Ss \&Sc
   .Ss \&Sh
   .Ss \&Sm
   .Ss \&So
   .Ss \&Sq
   .Ss \&Ss
   .Ss \&St
   .Ss \&Sx
   .Ss \&Sy
   .Ss \&Tn
   .Ss \&Ud
   Prints out
   .Dq currently under development.
   .Ss \&Ux
   Format the UNIX name.
   Accepts no argument.
   .Pp
   Examples:
   .D1 \&.Ux
   .Pp
   See also
   .Sx \&At ,
   .Sx \&Bsx ,
   .Sx \&Bx ,
   .Sx \&Dx ,
   .Sx \&Fx ,
   .Sx \&Nx ,
   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
   .Sx Block partial-implicit
   syntax when invoked as the first macro in the SYNOPSIS section, else it
   accepts ordinary
   .Sx In-line
   syntax.
   .Pp
   Note that this should not be confused with
   .Sx \&Ft ,
   which is used for function return types.
   .Pp
   Examples:
   .D1 \&.Vt unsigned char
   .D1 \&.Vt extern const char * const sys_signame[] ;
   .Pp
   See also
   .Sx \&Ft
   and
   .Sx \&Va .
   .Ss \&Xc
   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.
   .Ss \&Xr
   Link to another manual
   .Pq Qq cross-reference .
   Its calling syntax is
   .Pp
   .D1 \. Ns Sx \&Xr Cm name section
   .Pp
   The
   .Cm name
   and
   .Cm section
   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
   .Xr groff 1 .
   .Pp
   Examples:
   .D1 \&.Xr mandoc 1
   .D1 \&.Xr mandoc 1 ;
   .D1 \&.Xr mandoc 1 \&Ns s behaviour
   .Ss \&br
   .Ss \&sp
   .Sh COMPATIBILITY
   This section documents compatibility between mandoc and other other
   troff implementations, at this time limited to GNU troff
   .Pq Qq groff .
   The term
 .Qq historic groff  .Qq historic groff
 refers to those versions before the  refers to groff versions before the
 .Pa doc.tmac  .Pa doc.tmac
 file re-write  file re-write
 .Pq somewhere between 1.15 and 1.19 .  .Pq somewhere between 1.15 and 1.19 .
 .\" PARAGRAPH------------  
 .Pp  .Pp
   Heirloom troff, the other significant troff implementation accepting
   \-mdoc, is similar to historic groff.
   .Pp
 .Bl -dash -compact  .Bl -dash -compact
 .\" LIST-ITEM  
 .It  .It
 In quoted literals, groff allowed pair-wise double-quotes to produce a  The comment syntax
 standalone double-quote in formatted output.  This idiosyncratic  .Sq \e."
 behaviour is no longer applicable.  is no longer accepted.
 .\" LIST-ITEM  
 .It  .It
 The  In groff, the
 .Sq \&sp  .Sx \&Pa
 macro does not accept negative numbers.  macro does not format its arguments when used in the FILES section under
 .\" LIST-ITEM  certain list types.
   mandoc does.
 .It  .It
 Some character sequences in groff are not handled depending on escape  Historic groff does not print a dash for empty
 style, e.g.,  .Sx \&Fl
 .Sq \e(ba  arguments.
 and  mandoc and newer groff implementations do.
 .Sq \e*(Ba  
 may not be interchanged.  This is no longer the case: all character  
 sequences resolve to the same symbol, regardless the escape style.  
 .\" LIST-ITEM  
 .It  .It
 Blocks of whitespace are stripped from both macro and free-form text  groff behaves irregularly when specifying
 lines (except when in literal mode), while groff would retain whitespace  .Sq \ef
 in free-form text lines.  .Sx Text Decoration
 .\" LIST-ITEM  within line-macro scopes.
   mandoc follows a consistent system.
 .It  .It
 Historic groff has many un-callable macros.  Most of these (excluding  In mandoc, negative scaling units are truncated to zero; groff would
 some block-level macros) are now callable, conforming to the  move to prior lines.
 non-historic groff version.  Furthermore, the
 .\" LIST-ITEM  .Sq f
   scaling unit, while accepted, is rendered as the default unit.
 .It  .It
 The vertical bar  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.
   .It
   Display types
   .Sx \&Bd
   .Fl center
   and
   .Fl right
   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),
   .Fl ragged
   and
   .Fl filled
   are aliases, as are
   .Fl literal
   and
   .Fl unfilled .
   .It
   Historic groff has many un-callable macros.
   Most of these (excluding some block-level macros) are now callable.
   .It
   The vertical bar
 .Sq \(ba  .Sq \(ba
 made historic groff  made historic groff
 .Qq go orbital  .Qq go orbital
 but is a proper delimiter in this implementation.  but has been a proper delimiter since then.
 .\" LIST-ITEM  
 .It  .It
 .Sq \&It \-nested  .Sx \&It Fl nested
 is assumed for all lists (it wasn't in historic groff): any list may be  is assumed for all lists (it wasn't in historic groff): any list may be
 nested and  nested and
 .Sq \-enum  .Fl enum
 lists will restart the sequence only for the sub-list.  lists will restart the sequence only for the sub-list.
 .\" LIST-ITEM  
 .It  .It
 .Sq \&It \-column  
 syntax where column widths may be preceded by other arguments (instead  
 of proceeded) is not supported.  
 .\" LIST-ITEM  
 .It  
 The  
 .Sq \&At  
 macro only accepts a single parameter.  
 .\" LIST-ITEM  
 .It  
 Some manuals use  Some manuals use
 .Sq \&Li  .Sx \&Li
 incorrectly by following it with a reserved character and expecting the  incorrectly by following it with a reserved character and expecting the
 delimiter to render.  This is not supported.  delimiter to render.
 .\" LIST-ITEM  This is not supported in mandoc.
 .It  .It
 If an special-character control character is escaped  In groff, the
 .Sq \e\e ,  .Sx \&Fo
 it will obviously not render the subsequent sequence.  Even newer  macro only produces the first parameter.
 versions of groff seem to dither on this.  This is not the case in mandoc.
 .\" LIST-ITEM  
 .It  .It
 In groff, the  In groff, the
 .Sq \&Fo  .Sx \&Cd ,
 macro only produces the first parameter.  This is no longer the case.  .Sx \&Er ,
   .Sx \&Ex ,
   and
   .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  .El
 .\" SECTION---------------------------------------------  
 .Sh SEE ALSO  .Sh SEE ALSO
 .Xr mandoc 1 ,  .Xr mandoc 1 ,
 .Xr mandoc_char 7  .Xr mandoc_char 7
 .\" SECTION---------------------------------------------  
 .Sh AUTHORS  .Sh AUTHORS
 The  The
 .Nm  .Nm
 reference was written by  reference was written by
 .An Kristaps Dzonsons Aq kristaps@kth.se .  .An Kristaps Dzonsons Aq kristaps@bsd.lv .
 .\" SECTION---------------------------------------------  .\"
 .Sh CAVEATS  .\" XXX: this really isn't the place for these caveats.
 There are many ambiguous parts of mdoc.  .\" .
 .\" PARAGRAPH------------  .\" .
 .Pp  .\" .Sh CAVEATS
 .Bl -dash -compact  .\" There are many ambiguous parts of mdoc.
 .\" LIST-ITEM  .\" .
 .It  .\" .Pp
 .Sq \&Fa  .\" .Bl -dash -compact
 should be  .\" .It
 .Sq \&Va  .\" .Sq \&Fa
 as function arguments are variables.  .\" should be
 .\" LIST-ITEM  .\" .Sq \&Va
 .It  .\" as function arguments are variables.
 .Sq \&Ft  .\" .It
 should be  .\" .Sq \&Ft
 .Sq \&Vt  .\" should be
 as function return types are still types.  Furthermore, the  .\" .Sq \&Vt
 .Sq \&Ft  .\" as function return types are still types.  Furthermore, the
 should be removed and  .\" .Sq \&Ft
 .Sq \&Fo ,  .\" should be removed and
 which ostensibly follows it, should follow the same convention as  .\" .Sq \&Fo ,
 .Sq \&Va .  .\" which ostensibly follows it, should follow the same convention as
 .\" LIST-ITEM  .\" .Sq \&Va .
 .It  .\" .It
 .Sq \&Va  .\" .Sq \&Va
 should formalise that only one or two arguments are acceptable: a  .\" should formalise that only one or two arguments are acceptable: a
 variable name and optional, preceding type.  .\" variable name and optional, preceding type.
 .\" LIST-ITEM  .\" .It
 .It  .\" .Sq \&Fd
 .Sq \&Fd  .\" is ambiguous.  It's commonly used to indicate an include file in the
 is ambiguous.  It's commonly used to indicate an include file in the  .\" synopsis section.
 synopsis section.  .\" .Sq \&In
 .Sq \&In  .\" should be used, instead.
 should be used, instead.  .\" .It
 .\" LIST-ITEM  .\" Only the
 .It  .\" .Sq \-literal
 Only the  .\" argument to
 .Sq \-literal  .\" .Sq \&Bd
 argument to  .\" makes sense.  The remaining ones should be removed.
 .Sq \&Bd  .\" .It
 makes sense.  The remaining ones should be removed.  .\" The
 .\" LIST-ITEM  .\" .Sq \&Xo
 .It  .\" and
 The  .\" .Sq \&Xc
 .Sq \&Xo  .\" macros should be deprecated.
 and  .\" .It
 .Sq \&Xc  .\" The
 macros should be deprecated.  .\" .Sq \&Dt
 .\" LIST-ITEM  .\" macro lacks clarity.  It should be absolutely clear which title will
 .It  .\" render when formatting the manual page.
 The  .\" .It
 .Sq \&Dt  .\" A
 macro lacks clarity.  It should be absolutely clear which title will  .\" .Sq \&Lx
 render when formatting the manual page.  .\" should be provided for Linux (\(`a la
 .\" LIST-ITEM  .\" .Sq \&Ox ,
 .It  .\" .Sq \&Nx
 A  .\" etc.).
 .Sq \&Lx  .\" .It
 should be provided for Linux (\(`a la  .\" There's no way to refer to references in
 .Sq \&Ox ,  .\" .Sq \&Rs/Re
 .Sq \&Nx  .\" blocks.
 etc.).  .\" .It
 .\" LIST-ITEM  .\" The \-split and \-nosplit dictates via
 .It  .\" .Sq \&An
 There's no way to refer to references in  .\" are re-set when entering and leaving the AUTHORS section.
 .Sq \&Rs/Re  .\" .El
 blocks.  .\" .
 .\" LIST-ITEM  
 .It  
 The \-split and \-nosplit arguments to  
 .Sq \&An  
 are inane.  
 .El  
Legend:
Removed from v.1.49  
changed lines
  Added in v.1.113
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