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| Concrete syntaxes | |||||
A concrete syntax can be specified in the SGML Declaration, or a public identifier can be provided describing a public concrete syntax. If a public identifier is provided, the entity text associated with the public identifier must conform to the part of a concrete syntax defined by production [182] in ISO 8879, the SGML standard, starting with "shunned character number identification". In other words, the entity text must be what would be put in the SGML Declaration following the keyword SYNTAX (but it cannot be another public identifier). More precisely:
external public concrete syntax description =
shunned character number identification, ps+,
syntax-reference character set, ps+,
function character identification, ps+,
naming rules, ps+, delimiter set, ps+,
reserved name use, ps+, quantity set
ps+ can be any combination of white space characters and SGML comments. Unlike a #CHARSET or #CAPACITY entity, a #SYNTAX entity must contain something other than white space and comments: all parts of an "external public concrete syntax description" must be present.
Shown below is the Reference Concrete Syntax that appears in ISO 8879-1986 ("ISO 8879-1986//SYNTAX Reference//EN"). This is the "default" syntax that will be used if you do not define your own when building SGML documents.
SHUNCHAR 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 127 255
BASESET
"ISO 646-1983//CHARSET International Reference Version (IRV)//ESC 2/5 4/0"
DESCSET 0 256 0
FUNCTION
RE 13
RS 10
SPACE 32
TAB SEPCHAR 9
NAMING
LCNMSTRT ""
UCNMSTRT ""
LCNMCHAR "-."
UCNMCHAR "-."
NAMECASE
GENERAL YES
ENTITY NO
DELIM
GENERAL SGMLREF
SHORTREF SGMLREF
NAMES SGMLREF
QUANTITY SGMLREF
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