📄 sgmls.txt
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ity set. In some environments, higher values may be supported for the SUBDOC parameter. Documents that do not use optional features are also sup- ported. For example, if FORMAL NO is specified in the SGML declaration, public identifiers will not be required to be valid formal public identifiers. Certain parts of the concrete syntax may be changed: The shunned character numbers can be changed. Eight bit characters can be assigned to LCNMSTRT, UCNMSTRT, LCNMCHAR and UCNMCHAR. Uppercase substitution can be performed or not per- formed both for entity names and for other names. Either short reference delimiters assigned by the reference delimiter set or no short reference delimiters are supported. The reserved names can be changed. 6SGMLS(1) SGMLS(1) The quantity set can be increased within certain limits subject to there being sufficient memory available. The upper limit on NAMELEN is 239. The upper limits on ATTCNT, ATTSPLEN, BSEQLEN, ENTLVL, LITLEN, PILEN, TAGLEN, and TAGLVL are more than thirty times greater than the reference limits. The upper limit on GRPCNT, GRPGTCNT, and GRPLVL is 253. NORMSEP cannot be changed. DTAGLEN are DTEMPLEN irrelevant since sgmls does not support the DATATAG feature. SGML declaration The SGML declaration may be omitted, the following decla- ration will be implied: <!SGML "ISO 8879:1986" CHARSET BASESET "ISO 646-1983//CHARSET International Reference Version (IRV)//ESC 2/5 4/0" DESCSET 0 9 UNUSED 9 2 9 11 2 UNUSED 13 1 13 14 18 UNUSED 32 95 32 127 1 UNUSED CAPACITY PUBLIC "ISO 8879:1986//CAPACITY Reference//EN" SCOPE DOCUMENT SYNTAX PUBLIC "ISO 8879:1986//SYNTAX Reference//EN" FEATURES MINIMIZE DATATAG NO OMITTAG YES RANK NO SHORTTAG YES LINK SIMPLE NO IMPLICIT NO EXPLICIT NO OTHER CONCUR NO SUBDOC YES 99999999 FORMAL YES APPINFO NONE> with the exception that characters 128 through 254 will be assigned to DATACHAR. Sgmls identifies base character sets using the designating sequence in the public identifier. The following desig- nating sequences are recognized: Designating ISO Minimum Number Escape Registration Character of Description Sequence Number Number Characters ------------------------------------------------------------------------------------ ESC 2/5 4/0 - 0 128 full set of ISO 646 IRV ESC 2/8 4/0 2 33 94 G0 set of ISO 646 IRV ESC 2/8 4/2 6 33 94 G0 set of ASCII ESC 2/13 4/1 100 32 96 G1 set of ISO 8859-1 ESC 2/1 4/0 1 0 32 C0 set of ISO 646 ESC 2/2 4/3 77 0 32 C1 set of ISO 6429 ESC 2/5 2/15 3/0 - 0 256 the system character set When one of the G0 sets is used as a base set, the charac- ters SPACE and DELETE are treated as occurring at posi- tions 32 and 127 respectively; although these characters 7SGMLS(1) SGMLS(1) are not part of the character sets designated by the escape sequences, this mimics the behaviour of ISO 2022 with respect to these code positions. Output format The output is a series of lines. Lines can be arbitrarily long. Each line consists of an initial command character and one or more arguments. Arguments are separated by a single space, but when a command takes a fixed number of arguments the last argument can contain spaces. There is no space between the command character and the first argu- ment. Arguments can contain the following escape sequences. \\ A \. \n A record end character. \| Internal SDATA entities are bracketed by these. \nnn The character whose code is nnn octal. A record start character will be represented by \012. Most applications will need to ignore \012 and translate \n into newline. The possible command characters and arguments are as fol- lows: (gi The start of an element whose generic identifier is gi. Any attributes for this element will have been specified with A commands. )gi The end an element whose generic identifier is gi. -data Data. &name A reference to an external data entity name; name will have been defined using an E command. ?pi A processing instruction with data pi. Aname val The next element to start has an attribute name with value val which takes one of the following forms: IMPLIED The value of the attribute is implied. CDATA data The attribute is character data. This is used for attributes whose declared value is CDATA. 8SGMLS(1) SGMLS(1) NOTATION nname The attribute is a notation name; nname will have been defined using a N command. This is used for attributes whose declared value is NOTATION. ENTITY name... The attribute is a list of general entity names. Each entity name will have been defined using an I, E or S command. This is used for attributes whose declared value is ENTITY or ENTITIES. TOKEN token... The attribute is a list of tokens. This is used for attributes whose declared value is anything else. Dename name val This is the same as the A command, except that it specifies a data attribute for an external entity named ename. Any D commands will come after the E command that defines the entity to which they apply, but before any & or A commands that refer- ence the entity. Nnname nname. Define a notation This command will be pre- ceded by a p command if the notation was declared with a public identifier, and by a s command if the notation was declared with a system identifier. A notation will only be defined if it is to be refer- enced in an E command or in an A command for an attribute with a declared value of NOTATION. Eename typ nname Define an external data entity named ename with type typ (CDATA, NDATA or SDATA) and notation not. This command will be preceded by one or more f com- mands giving the filenames generated by the entity manager from the system and public identifiers, by a p command if a public identifier was declared for the entity, and by a s command if a system identi- fier was declared for the entity. not will have been defined using a N command. Data attributes may be specified for the entity using D commands. An external data entity will only be defined if it is to be referenced in a & command or in an A com- mand for an attribute whose declared value is ENTITY or ENTITIES. Iename typ text Define an internal data entity named ename with type typ (CDATA or SDATA) and entity text text. An internal data entity will only be defined if it is 9SGMLS(1) SGMLS(1) referenced in an A command for an attribute whose declared value is ENTITY or ENTITIES. Sename Define a subdocument entity named ename. This com- mand will be preceded by one or more f commands giving the filenames generated by the entity man- ager from the system and public identifiers, by a p command if a public identifier was declared for the entity, and by a s command if a system identifier was declared for the entity. A subdocument entity will only be defined if it is referenced in a { command or in an A command for an attribute whose declared value is ENTITY or ENTITIES. ssysid This command applies to the next E, S or N command and specifies the associated system identifier. ppubid This command applies to the next E, S or N command and specifies the associated public identifier. ffilename This command applies to the next E or S command and specifies an associated filename. There will be more than one f command for a single E or S command if the system identifier used a colon. {ename The start of the SGML subdocument entity ename; ename will have been defined using a S command. }ename The end of the SGML subdocument entity ename. Llineno file Llineno Set the current line number and filename. The filename argument will be omitted if only the line number has changed. This will be output only if the -l option has been given. #text An APPINFO parameter of text was specified in the SGML declaration. This is not strictly part of the ESIS, but a structure-controlled application is permitted to act on it. No # command will be out- put if APPINFO NONE was specified. A # command will occur at most once, and may be preceded only by a single L command. C This command indicates that the document was a con- forming SGML document. If this command is output, it will be the last command. An SGML document is not conforming if it references a subdocument entity that is not conforming.BUGS Some non-SGML characters in literals are counted as two 10SGMLS(1) SGMLS(1) characters for the purposes of quantity and capacity cal- culations.SEE ALSO The SGML Handbook, Charles F. Goldfarb ISO 8879 (Standard Generalized Markup Language), Interna- tional Organization for StandardizationORIGIN ARCSGML was written by Charles F. Goldfarb. Sgmls was derived from ARCSGML by James Clark (jjc@jclark.com), to whom bugs should be reported. 11⌨️ 快捷键说明
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