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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML Strict//EN"><HTML><HEAD><TITLE>Nsgmls Output Format</TITLE></HEAD><BODY><H1>Nsgmls Output Format</H1><P>The output is a series of lines.Lines can be arbitrarily long.Each line consists of an initial command characterand one or more arguments.Arguments are separated by a single space,but when a command takes a fixed number of argumentsthe last argument can contain spaces.There is no space between the command character and the first argument.Arguments can contain the following escape sequences:<DL><DT><CODE>\\</CODE><DD>A<CODE>\</CODE>.<DT><CODE>\n</CODE><DD>A record end character.<DT><CODE>\|</CODE><DD>Internal SDATA entities are bracketed by these.<DT><CODE>\<VAR>nnn</VAR></CODE><DD>The character whose code is<CODE><VAR>nnn</VAR></CODE>octal.<P>A record start character will be represented by<CODE>\012</CODE>.Most applications will need to ignore<CODE>\012</CODE>and translate<CODE>\n</CODE>into newline.<DT><CODE>\#<VAR>n</VAR>;</CODE><DD>The character whose number is<CODE><VAR>n</VAR></CODE>decimal in the internal character set.<CODE><VAR>n</VAR></CODE>can have any number of digits.This is used for characters that are not representable by theencoding used for output.This will only occur with the multibyte version of nsgmls.<DT><CODE>\%<VAR>n</VAR>;</CODE><DD>The character whose number is<CODE><VAR>n</VAR></CODE>decimal in the document character set.<CODE><VAR>n</VAR></CODE>can have any number of digits.This is used for data characters resulting from numericcharacter references to non-SGML charactersin <A HREF="charset.htm#fixed">fixed character set mode</A>.</DL><P>The possible command characters and arguments are as follows:<DL><DT><CODE>(<VAR>gi</VAR></CODE><DD>The start of an element whose generic identifier is<CODE><VAR>gi</VAR></CODE>.Any attributes for this elementwill have been specified with<CODE>A</CODE>commands.<DT><CODE>)<VAR>gi</VAR></CODE><DD>The end of an element whose generic identifier is<CODE><VAR>gi</VAR></CODE>.<DT><CODE>-<VAR>data</VAR></CODE><DD>Data.<DT><CODE>&<VAR>name</VAR></CODE><DD>A reference to an external data entity<CODE><VAR>name</VAR></CODE>;<CODE><VAR>name</VAR></CODE>will have been defined using an<CODE>E</CODE>command.<DT><CODE>?<VAR>pi</VAR></CODE><DD>A processing instruction with data<CODE><VAR>pi</VAR></CODE>.<DT><CODE>A<VAR>name</VAR> <VAR>val</VAR></CODE><DD>The next element to start has an attribute<CODE><VAR>name</VAR></CODE>with value<CODE><VAR>val</VAR></CODE>which takes one of the following forms:<DL><DT><CODE>IMPLIED</CODE><DD>The value of the attribute is implied.<DT><CODE>CDATA <VAR>data</VAR></CODE><DD>The attribute is character data.This is used for attributes whose declared value is<CODE>CDATA</CODE>.<DT><CODE>NOTATION <VAR>nname</VAR></CODE><DD>The attribute is a notation name;<CODE><VAR>nname</VAR></CODE>will have been defined using a<CODE>N</CODE>command.This is used for attributes whose declared value is<CODE>NOTATION</CODE>.<DT><CODE>ENTITY <VAR>name...</VAR></CODE><DD>The attribute is a list of general entity names.Each entity name will have been defined using an<CODE>I</CODE>,<CODE>E</CODE>or<CODE>S</CODE>command.This is used for attributes whose declared value is<CODE>ENTITY</CODE>or<CODE>ENTITIES</CODE>.<DT><CODE>TOKEN <VAR>token...</VAR></CODE><DD>The attribute is a list of tokens.This is used for attributes whose declared value is anything else.<DT><CODE>ID <VAR>token</VAR></CODE><DD>The attribute is an ID value.This will be output only if the<CODE>-oid</CODE>option is specified.Otherwise<CODE>TOKEN</CODE>will be used for ID values.</DL><DT><CODE>D<VAR>ename</VAR> <VAR>name</VAR> <VAR>val</VAR></CODE><DD>This is the same as the<CODE>A</CODE>command, except that it specifies a data attribute for anexternal entity named<CODE><VAR>ename</VAR></CODE>.Any<CODE>D</CODE>commands will come after the<CODE>E</CODE>command that defines the entity to which they apply, butbefore any<CODE>&</CODE>or<CODE>A</CODE>commands that reference the entity.<DT><CODE>a<VAR>type</VAR> <VAR>name</VAR> <VAR>val</VAR></CODE><DD>The next element to start has a link attribute with link type<CODE><VAR>type</VAR></CODE>,name<CODE><VAR>name</VAR></CODE>,and value<CODE><VAR>val</VAR></CODE>,which takes the same form as with the<CODE>A</CODE>command.<DT><CODE>N<VAR>nname</VAR></CODE><DD>Define a notation <CODE><VAR>nname</VAR></CODE>.This command will be preceded by a<CODE>p</CODE>command if the notation was declared with a public identifier,and by a<CODE>s</CODE>command if the notation was declared with a system identifier.If the<CODE>-onotation-sysid</CODE>option was specified,this command will also be preceded by an<CODE>f</CODE>command giving the system identifier generated by the entity manager(unless it was unable to generate one).A notation will only be defined if it is to be referencedin an<CODE>E</CODE>command or in an<CODE>A</CODE>command for an attribute with a declared value of<CODE>NOTATION</CODE>.<DT><CODE>E<VAR>ename</VAR> <VAR>typ</VAR> <VAR>nname</VAR></CODE><DD>Define an external data entity named<CODE><VAR>ename</VAR></CODE>with type<CODE><VAR>typ</VAR></CODE>(<CODE>CDATA</CODE>, <CODE>NDATA</CODE> or <CODE>SDATA</CODE>)and notation <CODE><VAR>not</VAR></CODE>.Thiscommand will be preceded by an<CODE>f</CODE>command giving the system identifier generated by the entity manager(unless it was unable to generate one),by a<CODE>p</CODE>command if a public identifier was declared for the entity,and by a<CODE>s</CODE>command if a system identifier was declared for the entity.<CODE><VAR>not</VAR></CODE>will have been defined using a<CODE>N</CODE>command.Data attributes may be specified for the entity using<CODE>D</CODE>commands.If the<CODE>-oentity</CODE>option is not specified,an external data entity will only be defined if it is to be referenced in a<CODE>&</CODE>command or in an<CODE>A</CODE>command for an attribute whose declared value is<CODE>ENTITY</CODE>or<CODE>ENTITIES</CODE>.<DT><CODE>I<VAR>ename</VAR> <VAR>typ</VAR> <VAR>text</VAR></CODE><DD>Define an internal data entity named<CODE><VAR>ename</VAR></CODE>with type<CODE><VAR>typ</VAR></CODE>and entity text<CODE><VAR>text</VAR></CODE>.The<CODE><VAR>typ</VAR></CODE>will be<CODE>CDATA</CODE>or<CODE>SDATA</CODE>unless the<CODE>-oentity</CODE>option was specified,in which case it can also be<CODE>PI</CODE>or<CODE>TEXT</CODE>(for an SGML text entity).If the<CODE>-oentity</CODE>option is not specified,an internal data entity will only be defined if it is referenced in an<CODE>A</CODE>command for an attribute whose declared value is<CODE>ENTITY</CODE>or<CODE>ENTITIES</CODE>.<DT><CODE>S<VAR>ename</VAR></CODE><DD>Define a subdocument entity named<CODE><VAR>ename</VAR></CODE>.This command will be preceded by an<CODE>f</CODE>command giving the system identifier generated by the entity manager(unless it was unable to generate one),by a<CODE>p</CODE>command if a public identifier was declared for the entity,and by a<CODE>s</CODE>command if a system identifier was declared for the entity.If the<CODE>-oentity</CODE>option is not specified,a subdocument entity will only be defined if it is referencedin a<CODE>{</CODE>commandor in an<CODE>A</CODE>command for an attribute whose declared value is<CODE>ENTITY</CODE>or<CODE>ENTITIES</CODE>.<DT><CODE>T<VAR>ename</VAR></CODE><DD>Define an external SGML text entity named<CODE><VAR>ename</VAR></CODE>.This command will be preceded by an<CODE>f</CODE>command giving the system identifier generated by the entity manager(unless it was unable to generate one),by a<CODE>p</CODE>command if a public identifier was declared for the entity,and by a<CODE>s</CODE>command if a system identifier was declared for the entity.This command will be output only if the<CODE>-oentity</CODE>option is specified.<DT><CODE>s<VAR>sysid</VAR></CODE><DD>This command applies to the next<CODE>E</CODE>,<CODE>S</CODE>,<CODE>T</CODE>or<CODE>N</CODE>command and specifies the associated system identifier.<DT><CODE>p<VAR>pubid</VAR></CODE><DD>This command applies to the next<CODE>E</CODE>,<CODE>S</CODE>,<CODE>T</CODE>or<CODE>N</CODE>command and specifies the associated public identifier.<DT><CODE>f<VAR>sysid</VAR></CODE><DD>This command applies to the next<CODE>E</CODE>,<CODE>S</CODE>,<CODE>T</CODE>or, if the<CODE>-onotation-sysid</CODE>option was specified,<CODE>N</CODE>command and specifies the system identifiergenerated by the entity manager from the specified external identifierand other information about the entity or notation.<DT><CODE>{<VAR>ename</VAR></CODE><DD>The start of the SGML subdocument entity<CODE><VAR>ename</VAR></CODE>;<CODE><VAR>ename</VAR></CODE>will have been defined using a<CODE>S</CODE>command.<DT><CODE>}<VAR>ename</VAR></CODE><DD>The end of the SGML subdocument entity<CODE><VAR>ename</VAR></CODE>.<DT><CODE>L<VAR>lineno</VAR> <VAR>file</VAR></CODE><DT><CODE>L<VAR>lineno</VAR></CODE><DD>Set the current line number and filename.The<CODE><VAR>file</VAR></CODE>argument will be omitted if only the line number has changed.This will be output only if the<CODE>-l</CODE>option has been given.<DT><CODE>#<VAR>text</VAR></CODE><DD>An APPINFO parameter of<CODE><VAR>text</VAR></CODE>was specified in the SGML declaration.This is not strictly part of the ESIS, but a structure-controlledapplication is permitted to act on it.No<CODE>#</CODE>command will be output if<CODE>APPINFO NONE</CODE>was specified.A<CODE>#</CODE>command will occur at most once,and may be preceded only by a single<CODE>L</CODE>command.<DT><CODE>C</CODE><DD>This command indicates that the document was a conforming SGML document.If this command is output, it will be the last command.An SGML document is not conforming if it references a subdocument entitythat is not conforming.<DT><CODE>i</CODE><DD>The next element to start is an included subelement.This will be output only if the<CODE>-oincluded</CODE>option is specified.<DT><CODE>e</CODE><DD>The next element to start has a declared content of EMPTY or a contentreference attribute, and so its end-tag must be omitted.This will be output only if the<CODE>-oempty</CODE>option is specified.</DL><P><ADDRESS>James Clark<BR>jjc@jclark.com</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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