.\" $Id: mdoc.7,v 1.15 2009/03/23 16:02:56 kristaps Exp $ .\" .\" Copyright (c) 2009 Kristaps Dzonsons .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the .\" above copyright notice and this permission notice appear in all .\" copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL .\" WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED .\" WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE .\" AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL .\" DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR .\" PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER .\" TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR .\" PERFORMANCE OF THIS SOFTWARE. .\" .Dd $Mdocdate: March 23 2009 $ .Dt mdoc 7 .Os .\" SECTION .Sh NAME .Nm mdoc .Nd mdoc language reference .\" SECTION .Sh DESCRIPTION The .Nm mdoc language is used to format .Bx .Ux manuals. In this reference document, we describe the syntax, ontology and structure of the .Nm language. .\" PARAGRAPH .Pp An .Nm document follows simple rules: lines beginning with the control character .Sq \. are parsed for macros. Other lines are interpreted within the scope of prior macros: .Bd -literal -offset XXX \&.Sh Macro lines change control state. Other lines are interpreted within the current state. .Ed .\" PARAGRAPH .Pp Macros are two- or three-character sequences whose scope rules, rules that dictate handling of subsequent-line or same-line arguments, are governed by one of five classifications described in this document. .\" SECTION .Sh INPUT ENCODING .Nm documents may contain only graphable 7-bit ASCII characters, the space character .Sq \ , and, in certain circumstances, the tab character .Sq \et . All manuals must have .Sq \en line termination. .Pp The only time a blank line is acceptable is within the context of .Sq \&Bd \-literal or .Sq \&Bd \-unfilled . .Pp Tab characters .Pq \et are only acceptable when delimiting .Sq \&Bl \-column and in .Sq \&Bd \-literal or .Sq \&Bd \-unfilled contexts. .\" SUB-SECTION .Ss Reserved Characters Within a macro line, the following characters are reserved: .Bl -tag -width 12n -offset XXXX -compact .It \&. .Pq period .It \&, .Pq comma .It \&: .Pq colon .It \&; .Pq semicolon .It \&( .Pq left-parenthesis .It \&) .Pq right-parenthesis .It \&[ .Pq left-bracket .It \&] .Pq right-bracket .It \&? .Pq question .It \&! .Pq exclamation .El .\" PARAGRAPH .Pp Use of reserved characters is described in .Sx Closure . For general non-reserved use, characters must either be escaped with a non-breaking space .Pq Sq \e& or, if applicable, an appropriate escape-sequence used. .\" SUB-SECTION .Ss Special Characters Special character sequences begin with the escape character .Sq \\ followed by either an open-parenthesis .Sq \&( for two-character sequences; an open-bracket .Sq \&[ for n-character sequences (terminated at a close-bracket .Sq \&] ) ; or a single one-character sequence. .Pp Characters may alternatively be escaped by a slash-asterisk, .Sq \\* , with the same combinations as described above. This form is deprecated. .Pp The following is a table of all available escapes. .Pp Grammatic: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(em .Pq em-dash .It \\(en .Pq en-dash .It \e- .Pq hyphen .It \\\\ .Pq back-slash .It \e' .Pq apostrophe .It \e` .Pq back-tick .It \\ .Pq space .It \\. .Pq period .It \\(r! .Pq upside-down exclamation .It \\(r? .Pq upside-down question .El .\" PARAGRAPH .Pp Enclosures: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(lh .Pq left hand .It \\(rh .Pq right hand .It \\(Fo .Pq left guillemet .It \\(Fc .Pq right guillemet .It \\(fo .Pq left guilsing .It \\(fc .Pq right guilsing .It \\(rC .Pq right brace .It \\(lC .Pq left brace .It \\(ra .Pq right angle .It \\(la .Pq left angle .It \\(rB .Pq right bracket .It \\(lB .Pq left bracket .It \\q .Pq double-quote .It \\(lq .Pq left double-quote .It \\(Lq .Pq left double-quote, deprecated .It \\(rq .Pq right double-quote .It \\(Rq .Pq right double-quote, deprecated .It \\(oq .Pq left single-quote .It \\(aq .Pq right single-quote .It \\(Bq .Pq right low double-quote .It \\(bq .Pq right low single-quote .El .\" PARAGRAPH .Pp Indicatives: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(<- .Pq left arrow .It \\(-> .Pq right arrow .It \\(ua .Pq up arrow .It \\(da .Pq down arrow .It \\(<> .Pq left-right arrow .It \\(lA .Pq left double-arrow .It \\(rA .Pq right double-arrow .It \\(uA .Pq up double-arrow .It \\(dA .Pq down double-arrow .It \\(hA .Pq left-right double-arrow .El .\" PARAGRAPH .Pp Mathematical: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(es .Pq empty set .It \\(ca .Pq intersection .It \\(cu .Pq union .It \\(gr .Pq gradient .It \\(pd .Pq partial differential .It \\(ap .Pq similarity .It \\(=) .Pq proper superset .It \\((= .Pq proper subset .It \\(eq .Pq equals .It \\(di .Pq division .It \\(mu .Pq multiplication .It \\(pl .Pq addition .It \\(nm .Pq not element .It \\(mo .Pq element .It \\(Im .Pq imaginary .It \\(Re .Pq real .It \\(Ah .Pq aleph .It \\(te .Pq existential quantifier .It \\(fa .Pq universal quantifier .It \\(AN .Pq logical AND .It \\(OR .Pq logical OR .It \\(no .Pq logical NOT .It \\(st .Pq such that .It \\(tf .Pq therefore .It \\(~~ .Pq approximate .It \\(~= .Pq approximately equals .It \\(=~ .Pq congruent .It \\(Gt .Pq greater-than, deprecated .It \\(Lt .Pq less-than, deprecated .It \\(<= .Pq less-than-equal .It \\(Le .Pq less-than-equal, deprecated .It \\(>= .Pq greater-than-equal .It \\(Ge .Pq greater-than-equal .It \\(== .Pq equal .It \\(!= .Pq not equal .It \\(Ne .Pq not equal, deprecated .It \\(if .Pq infinity .It \\(If .Pq infinity, deprecated .It \\(na .Pq NaN , an extension .It \\(Na .Pq NaN, deprecated .It \\(+- .Pq plus-minus .It \\(Pm .Pq plus-minus, deprecated .It \\(** .Pq asterisk .El .\" PARAGRAPH .Pp Ligatures: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(ss .Pq German eszett .It \\(AE .Pq upper-case AE .It \\(ae .Pq lower-case AE .It \\(OE .Pq upper-case OE .It \\(oe .Pq lower-case OE .It \\(ff .Pq ff ligature .It \\(fi .Pq fi ligature .It \\(fl .Pq fl ligature .It \\(Fi .Pq ffi ligature .It \\(Fl .Pq ffl ligature .El .\" PARAGRAPH .Pp Diacritics and letters: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(ga .Pq grave accent .It \\(aa .Pq accute accent .It \\(a" .Pq umlaut accent .It \\(ad .Pq dieresis accent .It \\(a~ .Pq tilde accent .It \\(a^ .Pq circumflex accent .It \\(ac .Pq cedilla accent .It \\(ad .Pq dieresis accent .It \\(ah .Pq caron accent .It \\(ao .Pq ring accent .It \\(ho .Pq hook accent .It \\(ab .Pq breve accent .It \\(a- .Pq macron accent .It \\(-D .Pq upper-case eth .It \\(Sd .Pq lower-case eth .It \\(TP .Pq upper-case thorn .It \\(Tp .Pq lower-case thorn .It \\('A .Pq upper-case acute A .It \\('E .Pq upper-case acute E .It \\('I .Pq upper-case acute I .It \\('O .Pq upper-case acute O .It \\('U .Pq upper-case acute U .It \\('a .Pq lower-case acute a .It \\('e .Pq lower-case acute e .It \\('i .Pq lower-case acute i .It \\('o .Pq lower-case acute o .It \\('u .Pq lower-case acute u .It \\(`A .Pq upper-case grave A .It \\(`E .Pq upper-case grave E .It \\(`I .Pq upper-case grave I .It \\(`O .Pq upper-case grave O .It \\(`U .Pq upper-case grave U .It \\(`a .Pq lower-case grave a .It \\(`e .Pq lower-case grave e .It \\(`i .Pq lower-case grave i .It \\(`o .Pq lower-case grave o .It \\(`u .Pq lower-case grave u .It \\(~A .Pq upper-case tilde A .It \\(~N .Pq upper-case tilde N .It \\(~O .Pq upper-case tilde O .It \\(~a .Pq lower-case tilde a .It \\(~n .Pq lower-case tilde n .It \\(~o .Pq lower-case tilde o .It \\(:A .Pq upper-case dieresis A .It \\(:E .Pq upper-case dieresis E .It \\(:I .Pq upper-case dieresis I .It \\(:O .Pq upper-case dieresis O .It \\(:U .Pq upper-case dieresis U .It \\(:a .Pq lower-case dieresis a .It \\(:e .Pq lower-case dieresis e .It \\(:i .Pq lower-case dieresis i .It \\(:o .Pq lower-case dieresis o .It \\(:u .Pq lower-case dieresis u .It \\(:y .Pq lower-case dieresis y .It \\(^A .Pq upper-case circumflex A .It \\(^E .Pq upper-case circumflex E .It \\(^I .Pq upper-case circumflex I .It \\(^O .Pq upper-case circumflex O .It \\(^U .Pq upper-case circumflex U .It \\(^a .Pq lower-case circumflex a .It \\(^e .Pq lower-case circumflex e .It \\(^i .Pq lower-case circumflex i .It \\(^o .Pq lower-case circumflex o .It \\(^u .Pq lower-case circumflex u .It \\(,C .Pq upper-case cedilla C .It \\(,c .Pq lower-case cedilla c .It \\(/L .Pq upper-case stroke L .It \\(/l .Pq lower-case stroke l .It \\(/O .Pq upper-case stroke O .It \\(/o .Pq lower-case stroke o .It \\(oA .Pq upper-case ring A .It \\(oa .Pq lower-case ring a .El .\" PARAGRAPH .Pp Monetary: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(Cs .Pq Scandinavian .It \\(Do .Pq dollar .It \\(Po .Pq pound .It \\(Ye .Pq yen .It \\(Fn .Pq florin .It \\(ct .Pq cent .El .\" PARAGRAPH .Pp Special symbols: .Bl -tag -width 12n -offset "XXXX" -compact .It \\(de .Pq degree .It \\(ps .Pq paragraph .It \\(sc .Pq section .It \\(dg .Pq dagger .It \\(dd .Pq double dagger .It \\(ci .Pq circle .It \\(ba .Pq bar .It \\(bb .Pq broken bar .It \\(Ba .Pq bar, deprecated .It \\(co .Pq copyright .It \\(rg .Pq registered .It \\(tm .Pq trademarked .It \\& .Pq non-breaking space .It \\e .Pq escape .It \\(Am .Pq ampersand, deprecated .El .\" SECTION .Sh ONTOLOGY Macros are classified in an ontology described by their scope rules. Some macros are allowed to deviate from their classifications to preserve backward-compatibility with old macro combinations still found in the manual corpus. These are specifically noted on a per-macro basis. .\" SUB-SECTION .Ss Scope .Bl -inset .\" LIST-ITEM .It Em Block macros enclose other block macros, in-line macros or text, and may span multiple lines. .Bl -inset -offset XXXX .\" LIST-ITEM .It Em Full-block macros always span multiple lines. They consist of zero or more .Qq heads , subsequent macros or text on the same line following invocation; an optional .Qq body , which spans subsequent lines of text or macros; and an optional .Qq tail , macros or text on the same line following closure. .\" LIST-ITEM .It Em Partial-block macros may span multiple lines. They consists of a optional .Qq head , text immediately following invocation; always a .Qq body , text or macros following the head on the same and subsequent lines; and optionally a .Qq tail , text immediately following closure. .\" LIST-ITEM .It Em In-line macros may only enclose text and span at most a single line. .El .El .\" SUB-SECTION .Ss Closure Closure of a macro's scope depends first on its classification, then on whether it's parsable. In this table, .Sq BFE refers to block full-explicit and so on. .\" PARAGRAPH .Pp .Bl -tag -width 12n -offset XXXX -compact .It BPE , BFE corresponding explicit closure macro .It BFI end-of-file or a corresponding implicit closure macro .It BPI end-of-line (body may be closed by >0 space-separated .Sx Reserved Characters , although block scope will still be open) .It INL end-of-line .El .\" PARAGRAPH .Pp If a macro (block or in-line) is parsable, it may also be closed out by one of the following scenarios (unless specifically noted otherwise): .\" PARAGRAPH .Pp .Bl -dash -offset XXXX -compact .It a sequence of >0 space-separated .Sx Reserved Characters , .It another macro, .It end-of-line, or .It completion of a set number of arguments. .El .\" PARAGRAPH .Pp If >0 space-separated .Sx Reserved Characters are followed by non-reserved characters, the behaviour differs per macro. In general, scope of the macro is closed and re-opened: subsequent tokens are interpreted as if the scope had just been opened. In other circumstances, scope is simply closed out. .\" SECTION .Sh SYNTAX Macros are generally two and at times three characters in length. The syntax of macro invocation depends on its classification. .Qq \-arg refers to the macro arguments (which may contain zero or more values). In these illustrations, .Sq \&.Yo opens the scope of a macro, and if specified, .Sq \&.Yc closes it out (closure may be implicit at end-of-line or end-of-file). .\" PARAGRAPH .Pp Block full-explicit (may contain head, body, tail). .Bd -literal -offset XXXX \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBhead...\(rB \(lBbody...\(rB \&.Yc \(lBtail...\(rB .Ed .\" PARAGRAPH .Pp Block full-implicit (may contain zero or more heads, body, no tail). .Bd -literal -offset XXXX \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBhead... \(lBTa head...\(rB\(rB \(lBbody...\(rB \&.Yc .Ed .\" PARAGRAPH .Pp Block partial-explicit (may contain head, multi-line body, tail). .Bd -literal -offset XXXX \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBhead...\(rB \(lBbody...\(rB \&.Yc \(lBtail...\(rB \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBhead...\(rB \ \(lBbody...\(rB \&Yc \(lBtail...\(rB .Ed .\" PARAGRAPH .Pp Block partial-implicit (no head, body, no tail). Note that the body section may be followed by zero or more .Sx Reserved Words . These are in the block scope, but not in the body scope. .Bd -literal -offset XXXX \&.Yo \(lB\-arg \(lBval...\(rB\(rB \(lBbody...\(rB \(lBreserved...\(rB .Ed .\" PARAGRAPH .Pp In-lines have \(>=0 scoped arguments. .Bd -literal -offset XXX \&.Yy \(lB\-arg \(lBval...\(rB\(rB \(lBargs...\(rB \&.Yy \(lB\-arg \(lBval...\(rB\(rB arg0 arg1 argN .Ed .\" .Sh MACROS This section contains a complete list of all .Nm macros, arranged ontologically. A .Qq callable macro is may be invoked subsequent to the initial macro-line macro. A .Qq parsable macro may be followed by further (ostensibly callable) macros. .\" SUB-SECTION .Ss Block full-implicit The head of these macros follows invocation; the body is the content of subsequent lines prior to closure. None of these macros have tails; some .Po .Sq \&It \-bullet , .Sq \-hyphen , .Sq \-dash , .Sq \-enum , .Sq \-item .Pc don't have heads. .Pp .Bl -column "MacroX" "CallableX" "ParsableX" "Closing" -compact -offset XXXX .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Closing .It \&.Sh Ta \&No Ta \&No Ta \&.Sh .It \&.Ss Ta \&No Ta \&No Ta \&.Sh, \&.Ss .It \&.It Ta \&No Ta Yes Ta \&.It, \&.El .El .\" SUB-SECTION .Ss Block full-explicit None of these macros are callable or parsed. The last column indicates the explicit scope rules. All contains bodies, some may contain heads .Pq So \&Bf Sc . .Pp .Bl -column "MacroX" "CallableX" "ParsableX" "closed by XXX" -compact -offset XXXX .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope .It \&.Bd Ta \&No Ta \&No Ta closed by \&.Ed .It \&.Ed Ta \&No Ta \&No Ta opened by \&.Bd .It \&.Bl Ta \&No Ta \&No Ta closed by \&.El .It \&.El Ta \&No Ta \&No Ta opened by \&.Bl .It \&.Bf Ta \&No Ta \&No Ta closed by \&.Ef .It \&.Ef Ta \&No Ta \&No Ta opened by \&.Bf .It \&.Bk Ta \&No Ta \&No Ta closed by \&.Ek .It \&.Ek Ta \&No Ta \&No Ta opened by \&.Bk .El .\" SUB-SECTION .Ss Block partial-implicit All of these are callable and parsed for further macros. Their scopes close at the invocation's end-of-line. .Pp .Bl -column "MacroX" "CallableX" "ParsableX" -compact -offset XXXX .It Em Macro Ta Em Callable Ta Em Parsable .It \&.Aq Ta Yes Ta Yes .It \&.Op Ta Yes Ta Yes .It \&.Bq Ta Yes Ta Yes .It \&.Dq Ta Yes Ta Yes .It \&.Pq Ta Yes Ta Yes .It \&.Qq Ta Yes Ta Yes .It \&.Sq Ta Yes Ta Yes .It \&.Brq Ta Yes Ta Yes .It \&.D1 Ta \&No Ta \&Yes .It \&.Dl Ta \&No Ta Yes .It \&.Ql Ta Yes Ta Yes .El .\" PARAGRAPH .Pp The .Sq \&Op may be broken by \&Oc as in the following example: .Bd -literal -offset XXXX \&.Oo \&.Op Fl a Oc .Ed .Pp In the above example, the scope of .Sq \&Op is technically broken by .Sq \&Oc , however, due to the overwhelming existence of this sequence, it's allowed. .\" SUB-SECTION .Ss Block partial-explicit Each of these contains at least a body and, in limited circumstances, a head .Pq So \&Fo Sc , So \&Eo Sc and/or tail .Pq So \&Ec Sc . .Pp .Bl -column "MacroX" "CallableX" "ParsableX" "closed by XXXX" -compact -offset XXXX .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Scope .It \&.Ao Ta Yes Ta Yes Ta closed by \&.Ac .It \&.Ac Ta Yes Ta Yes Ta opened by \&.Ao .It \&.Bc Ta Yes Ta Yes Ta closed by \&.Bo .It \&.Bo Ta Yes Ta Yes Ta opened by \&.Bc .It \&.Pc Ta Yes Ta Yes Ta closed by \&.Po .It \&.Po Ta Yes Ta Yes Ta opened by \&.Pc .It \&.Do Ta Yes Ta Yes Ta closed by \&.Dc .It \&.Dc Ta Yes Ta Yes Ta opened by \&.Do .It \&.Xo Ta Yes Ta Yes Ta closed by \&.Xc .It \&.Xc Ta Yes Ta Yes Ta opened by \&.Xo .It \&.Bro Ta Yes Ta Yes Ta closed by \&.Brc .It \&.Brc Ta Yes Ta Yes Ta opened by \&.Bro .It \&.Oc Ta Yes Ta Yes Ta closed by \&.Oo .It \&.Oo Ta Yes Ta Yes Ta opened by \&.Oc .It \&.So Ta Yes Ta Yes Ta closed by \&.Sc .It \&.Sc Ta Yes Ta Yes Ta opened by \&.So .It \&.Fc Ta Yes Ta Yes Ta opened by \&.Fo .It \&.Fo Ta \&No Ta \&No Ta closed by \&.Fc .It \&.Ec Ta Yes Ta Yes Ta opened by \&.Eo .It \&.Eo Ta Yes Ta Yes Ta closed by \&.Ec .It \&.Qc Ta Yes Ta Yes Ta opened by \&.Oo .It \&.Qo Ta Yes Ta Yes Ta closed by \&.Oc .It \&.Re Ta \&No Ta \&No Ta opened by \&.Rs .It \&.Rs Ta \&No Ta \&No Ta closed by \&.Re .El .\" SUB-SECTION .Ss In-line 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. .Pp .Bl -column "MacroX" "CallableX" "ParsableX" "Arguments" -compact -offset XXXX .It Em Macro Ta Em Callable Ta Em Parsable Ta Em Arguments .It \&.Dd Ta \&No Ta \&No Ta >0 .It \&.Dt Ta \&No Ta \&No Ta n .It \&.Os Ta \&No Ta \&No Ta n .It \&.Pp Ta \&No Ta \&No Ta 0 .It \&.Ad Ta Yes Ta Yes Ta n .It \&.An Ta \&No Ta Yes Ta n .It \&.Ar Ta Yes Ta Yes Ta n .It \&.Cd Ta Yes Ta \&No Ta >0 .It \&.Cm Ta Yes Ta Yes Ta n .It \&.Dv Ta Yes Ta Yes Ta n .It \&.Er Ta Yes Ta Yes Ta >0 .It \&.Ev Ta Yes Ta Yes Ta n .It \&.Ex Ta \&No Ta \&No Ta 0 .It \&.Fa Ta Yes Ta Yes Ta n .It \&.Fd Ta \&No Ta \&No Ta >0 .It \&.Fl Ta Yes Ta Yes Ta n .It \&.Fn Ta Yes Ta Yes Ta >0 .It \&.Ft Ta \&No Ta Yes Ta n .It \&.Ic Ta Yes Ta Yes Ta >0 .It \&.In Ta \&No Ta \&No Ta n .It \&.Li Ta Yes Ta Yes Ta n .It \&.Nd Ta \&No Ta \&No Ta n .It \&.Nm Ta Yes Ta Yes Ta n .It \&.Ot Ta \&No Ta \&No Ta n .It \&.Pa Ta Yes Ta Yes Ta n .It \&.Rv Ta \&No Ta \&No Ta 0 .It \&.St Ta \&No Ta Yes Ta 1 .It \&.Va Ta Yes Ta Yes Ta n .It \&.Vt Ta Yes Ta Yes Ta >0 .It \&.Xr Ta Yes Ta Yes Ta >0, <3 .It \&.%A Ta \&No Ta \&No Ta >0 .It \&.%B Ta \&No Ta \&No Ta >0 .It \&.%C Ta \&No Ta \&No Ta >0 .It \&.%D Ta \&No Ta \&No Ta >0 .It \&.%I Ta \&No Ta \&No Ta >0 .It \&.%J Ta \&No Ta \&No Ta >0 .It \&.%N Ta \&No Ta \&No Ta >0 .It \&.%O Ta \&No Ta \&No Ta >0 .It \&.%P Ta \&No Ta \&No Ta >0 .It \&.%R Ta \&No Ta \&No Ta >0 .It \&.%T Ta \&No Ta \&No Ta >0 .It \&.%V Ta \&No Ta \&No Ta >0 .It \&.At Ta Yes Ta Yes Ta 1 .It \&.Bsx Ta Yes Ta Yes Ta n .It \&.Bx Ta Yes Ta Yes Ta n .It \&.Db Ta \&No Ta \&No Ta 1 .It \&.Em Ta Yes Ta Yes Ta n .It \&.Fx Ta Yes Ta Yes Ta n .It \&.Ms Ta \&No Ta Yes Ta >0 .It \&.No Ta Yes Ta Yes Ta 0 .It \&.Ns Ta Yes Ta Yes Ta 0 .It \&.Nx Ta Yes Ta Yes Ta n .It \&.Ox Ta Yes Ta Yes Ta n .It \&.Pf Ta \&No Ta Yes Ta 1 .It \&.Sm Ta \&No Ta \&No Ta 1 .It \&.Sx Ta Yes Ta Yes Ta >0 .It \&.Sy Ta Yes Ta Yes Ta >0 .It \&.Tn Ta Yes Ta Yes Ta >0 .It \&.Ux Ta Yes Ta Yes Ta n .It \&.Dx Ta Yes Ta Yes Ta n .It \&.Bt Ta \&No Ta \&No Ta 0 .It \&.Hf Ta \&No Ta \&No Ta n .It \&.Fr Ta \&No Ta \&No Ta n .It \&.Ud Ta \&No Ta \&No Ta 0 .It \&.Lb Ta \&No Ta \&No Ta 1 .It \&.Ap Ta Yes Ta Yes Ta 0 .It \&.Lp Ta \&No Ta \&No Ta 0 .It \&.Lk Ta \&No Ta Yes Ta >0 .It \&.Mt Ta \&No Ta Yes Ta >0 .It \&.Es Ta \&No Ta \&No Ta 0 .It \&.En Ta \&No Ta \&No Ta 0 .El .Pp The .Sq \&Ot , .Sq \&Fr , .Sq \&Es and .Sq \&En , macros are obsolete. .\" SECTION .Sh COMPATIBILITY The mdoc language was traditionally a .Qq roff macro package; most existing manuals were written with mdoc syntax dictated by system-dependent roff installations. This section documents compatibility with these systems. .Pp .Bl -dash -compact .\" LIST-ITEM .It .Sq \&Fo and .Sq \&St historically weren't always callable. Both are now correctly callable. .\" LIST-ITEM .It .Sq \&It \-nested is assumed for all lists: any list may be nested and .Sq \-enum lists will restart the sequence only for the sub-list. .\" LIST-ITEM .It .Sq \&It \-column syntax where column widths may be preceeded by other arguments (instead of proceeded) is not supported. .\" LIST-ITEM .It The .Sq \&At macro only accepts a single parameter. .\" LIST-ITEM .It The system-name macros ( .Ns Sq \&At , .Sq \&Bsx , .Sq \&Bx , .Sq \&Fx , .Sq \&Nx , .Sq \&Ox , and .Sq \&Ux ) are callable. .\" LIST-ITEM .It Some manuals use .Sq \&Li incorrectly by following it with a reserved character and expecting the delimiter to render. This is not supported. .\" LIST-ITEM .It .Sq \&Cd is callable. .El .\" SECTION .Sh SEE ALSO .Xr mandoc 1 .\" SECTION .Sh AUTHORS The .Nm utility was written by .An Kristaps Dzonsons Aq kristaps@openbsd.org . .\" SECTION .Sh CAVEATS There are several ambiguous parts of mdoc. .Pp .Bl -dash -compact .\" LIST-ITEM .It .Sq \&Fa should be .Sq \&Va as function arguments are variables. .\" LIST-ITEM .It .Sq \&Ft should be .Sq \&Vt as function return types are still types. Furthermore, the .Sq \&Ft should be removed and .Sq \&Fo , which ostensibly follows it, should follow the same convention as .Sq \&Va . .\" LIST-ITEM .It .Sq \&Va should formalise that only one or two arguments are acceptable: a variable name and optional, preceeding type. .\" LIST-ITEM .It .Sq \&Fd is ambiguous. It's commonly used to indicate an include file in the synopsis section. .Sq \&In should be used, instead. .\" LIST-ITEM .It Only the .Sq \-literal argument to .Sq \&Bd makes sense. The remaining ones should be removed. .\" LIST-ITEM .It The .Sq \&Xo and .Sq \&Xc macros should be deprecated. .\" LIST-ITEM .It The .Sq \&Dt macro lacks clarity. It should be absolutely clear which title will render when formatting the manual page. .\" LIST-ITEM .It A .Sq \&Lx should be provided for Linux (\(`a la .Sq \&Ox , .Sq \&Nx etc.). .\" LIST-ITEM .It There's no way to refer to references in .Sq \&Rs/Re blocks. .El