Initial import of the CDE 2.1.30 sources from the Open Group.
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Peter Howkins
273
cde/programs/nsgmls/doc/sgmldecl.htm
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273
cde/programs/nsgmls/doc/sgmldecl.htm
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<!-- $XConsortium: sgmldecl.htm /main/1 1996/09/22 18:17:17 rws $ -->
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML Strict//EN">
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<HTML>
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<HEAD>
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<TITLE>SP - SGML declaration</TITLE>
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</HEAD>
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<BODY>
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<H1>Handling of the SGML declaration in SP</H1>
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<H2>Default SGML declaration</H2>
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<P>
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If the SGML declaration is omitted
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and there is no applicable
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<A HREF="catalog.htm#sgmldecl"><SAMP>SGMLDECL</SAMP></A>
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entry in a catalog,
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the following declaration will be implied:
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<PRE>
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<!SGML "ISO 8879:1986"
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CHARSET
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BASESET "ISO 646-1983//CHARSET
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International Reference Version (IRV)//ESC 2/5 4/0"
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DESCSET 0 9 UNUSED
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9 2 9
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11 2 UNUSED
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13 1 13
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14 18 UNUSED
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32 95 32
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127 1 UNUSED
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CAPACITY PUBLIC "ISO 8879:1986//CAPACITY Reference//EN"
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SCOPE DOCUMENT
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SYNTAX
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SHUNCHAR CONTROLS 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
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18 19 20 21 22 23 24 25 26 27 28 29 30 31 127 255
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BASESET "ISO 646-1983//CHARSET International Reference Version
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(IRV)//ESC 2/5 4/0"
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DESCSET 0 128 0
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FUNCTION RE 13
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RS 10
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SPACE 32
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TAB SEPCHAR 9
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NAMING LCNMSTRT ""
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UCNMSTRT ""
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LCNMCHAR "-."
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UCNMCHAR "-."
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NAMECASE GENERAL YES
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ENTITY NO
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DELIM GENERAL SGMLREF
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SHORTREF SGMLREF
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NAMES SGMLREF
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QUANTITY SGMLREF
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ATTCNT 99999999
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ATTSPLEN 99999999
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DTEMPLEN 24000
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ENTLVL 99999999
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GRPCNT 99999999
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GRPGTCNT 99999999
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GRPLVL 99999999
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LITLEN 24000
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NAMELEN 99999999
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PILEN 24000
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TAGLEN 99999999
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TAGLVL 99999999
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FEATURES
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MINIMIZE DATATAG NO
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OMITTAG YES
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RANK YES
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SHORTTAG YES
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LINK SIMPLE YES 1000
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IMPLICIT YES
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EXPLICIT YES 1
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OTHER CONCUR NO
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SUBDOC YES 99999999
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FORMAL YES
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APPINFO NONE>
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</PRE>
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<P>
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with the exception that all characters that are neither significant
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nor shunned will be assigned to DATACHAR.
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<H2>Character sets</H2>
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<P>
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A character in a base character set is described either by giving its
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number in a universal character set, or by specifying a minimum
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literal. The constraints on the choice of universal character set are
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that characters that are significant in the SGML reference concrete
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syntax must be in the universal character set and must have the same
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number in the universal character set as in ISO 646 and that each
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character in the character set must be represented by exactly one
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number; that character numbers in the range 0 to 31 and 127 to 159 are
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control characters (for the purpose of enforcing SHUNCHAR CONTROLS).
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It is recommended that ISO 10646 (Unicode) be used as the universal
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character set, except in environments where the normal document
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character sets are large character set which cannot be compactly
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described in terms of ISO 10646.
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The public identifier of a base character set can be associated
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with an entity that describes it by using a
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<SAMP>PUBLIC</SAMP>
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entry in the catalog entry file.
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The entity must be a fragment
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of an SGML declaration
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consisting of the
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portion of a character set description,
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following the DESCSET keyword,
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that is, it must be a sequence of character descriptions,
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where each character description specifies a described character
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number, the number of characters and
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either a character number in the universal character set, a minimum literal
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or the keyword
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<SAMP>UNUSED</SAMP>.
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Character numbers in the universal character set can be as big as
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99999999.
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<P>
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In addition SP has built in knowledge of a few character sets.
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These are identified using the designating sequence in the
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public identifier. The following designating sequences are
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recognized:
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<DL>
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<DT>
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<SAMP>ESC 2/5 4/0</SAMP>
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<DD>
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The full set of ISO 646 IRV.
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This is not a registered character set,
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but is recommended by ISO 8879 (clause 10.2.2.4).
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<DT>
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<SAMP>ESC 2/8 4/0</SAMP>
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<DD>
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G0 set of ISO 646 IRV,
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ISO Registration Number 2.
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<DT>
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<SAMP>ESC 2/8 4/2</SAMP>
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<DD>
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G0 set of ASCII,
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ISO Registration Number 6.
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<DT>
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<SAMP>ESC 2/1 4/0</SAMP>
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<DD>
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C0 set of ISO 646,
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ISO Registration Number 1.
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</DL>
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<P>
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All the above character sets will be treated as mapping character numbers
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0 to 127 inclusive as in ISO 646.
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<P>
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It is not necessary for every character set used in the SGML
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declaration to be known to SP
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provided that characters in the document character set that are
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significant both in the reference concrete syntax and in the described
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concrete syntax are described using known base character sets and that
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characters that are significant in the described concrete syntax are
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described using the same base character sets or the same minimum
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literals in both the document character set description and the syntax
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reference character set description.
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<H2>Concrete syntaxes</H2>
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<P>
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The public identifier for a public concrete syntax can be associated
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with an entity that describes using a
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<SAMP>PUBLIC</SAMP>
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entry in the catalog entry file.
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The entity must be a fragment of an SGML declaration
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consisting of a concrete syntax description
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starting with the
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<SAMP>SHUNCHAR</SAMP>
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keyword
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as in an SGML declaration.
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The entity can also make use of the following extensions:
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<UL>
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<LI>
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An
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<I>added function</I>
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can be expressed as a parameter literal
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instead of a name.
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<LI>
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The replacement for a reference reserved name
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can be expressed as a parameter literal instead of a name.
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<LI>
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The
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<SAMP>LCNMSTRT</SAMP>,
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<SAMP>UCNMSTRT</SAMP>,
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<SAMP>LCNMCHAR</SAMP>
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and
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<SAMP>UCNMCHAR</SAMP>
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keywords may each be followed by more than one parameter literal. A
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sequence of parameter literals has the same meaning as a single
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parameter literal whose content is the concatenation of the content of
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each of the literals in the sequence. This extension is useful
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because of the restriction on the length of a parameter literal in the
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SGML declaration to 240 characters.
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<LI>
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The total number of characters specified for
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<SAMP>UCNMCHAR</SAMP>
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or
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<SAMP>UCNMSTRT</SAMP>
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may exceed the total number of characters specified for
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<SAMP>LCNMCHAR</SAMP>
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or
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<SAMP>LCNMSTRT</SAMP>
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respectively.
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Each character in
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<SAMP>UCNMCHAR</SAMP>
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or
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<SAMP>UCNMSTRT</SAMP>
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which does not have a corresponding character in the same position in
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<SAMP>LCNMCHAR</SAMP>
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or
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<SAMP>LCNMSTRT</SAMP>
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is simply assigned to <SAMP>UCNMCHAR</SAMP> or <SAMP>UCNMSTRT</SAMP>
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without making it the upper-case form of any character.
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<LI>
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A parameter following any of
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<SAMP>LCNMSTRT</SAMP>,
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<SAMP>UCNMSTRT</SAMP>,
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<SAMP>LCNMCHAR</SAMP>
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and
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<SAMP>UCNMCHAR</SAMP>
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keywords may be followed by
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the name token <SAMP>...</SAMP>
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(three periods) and another parameter literal.
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This has the same meaning as the two parameter literals
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with a parameter literal in between
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containing in order each character whose number
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is greater than the number of the last character in
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the first parameter literal and less than the
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number of the first character in the second
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parameter literal.
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A parameter literal must contain at least one character for each
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<SAMP>...</SAMP>
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to which it is adjacent.
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<LI>
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A number may be used as a parameter following the
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<SAMP>LCNMSTRT</SAMP>,
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<SAMP>UCNMSTRT</SAMP>,
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<SAMP>LCNMCHAR</SAMP>
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and
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<SAMP>UCNMCHAR</SAMP>
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keywords or as a delimiter in the
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<SAMP>DELIM</SAMP>
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section with the same meaning as a parameter literal
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containing just a numeric character reference with that number.
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<LI>
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The parameters following the
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<SAMP>LCNMSTRT</SAMP>,
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<SAMP>UCNMSTRT</SAMP>,
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<SAMP>LCNMCHAR</SAMP>
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and
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<SAMP>UCNMCHAR</SAMP>
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keywords may be omitted.
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This has the same meaning as specifying
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an empty parameter literal.
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<LI>
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Within the specification of the short reference delimiters,
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a parameter literal containing exactly one character
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may be followed by the name token <SAMP>...</SAMP>
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and another parameter literal containing exactly one character.
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This has the same meaning as a sequence of parameter literals
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one for each character number that is greater than or equal
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to the number of the character in the first parameter literal
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and less than or equal to the number of the character in the
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second parameter literal.
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</UL>
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<H2>Capacity sets</H2>
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<P>
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The public identifier for a public capacity set can be associated
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with an entity that describes using a
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<SAMP>PUBLIC</SAMP>
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entry in the catalog entry file.
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The entity must be a fragment of an SGML declaration
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consisting of a sequence of capacity names and numbers.
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<P>
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<ADDRESS>
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James Clark<BR>
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jjc@jclark.com
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</ADDRESS>
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</BODY>
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</HTML>
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