SGML Reference Delimiter Roles

Each SGML reference delimiter role provides a character string for an abstract syntax delimiter role. Each is only meaningful within the context of certain recognition modes. The recognition modes and constraints are detailed in subclauses 9.6.1 and 9.6.2 and summarized in Figure 3 of ISO 8879-1986 and Goldfarb The SGML Handbook {9.6.2, 360:1}. The delimiter strings and ASCII character numbers are those in the syntax-reference character set of the reference concrete syntax.

The references are to the SGML syntactic variables as defined in the productions from the body of the ISO 8879 standard. They are also hyperlinks to the productions in SGML Syntax Summary.

Name String ASCII Modes Constraint Description of Role

Syntactic Variable[Production]

and & (38) GRP And connector

connector[131]

com -- (45 45) CTX MD Comment start or end

comment[92]

cro &# (38 45) CON LIT CREF Character reference open

character reference[62]

dsc ] (93) DS MD ENT Declaration subset close

document type declaration[110]
data attribute specification[149.2]
link type declaration[154]
link attribute specification[166]
result attribute specification[168]

dso [ (91) CTX MD Declaration subset open

marked section declaration[93]
marked section start[94]
document type declaration[110]
data attribute specification[149.2]
link type declaration[154]
link attribute specification[166]
result attribute specification[168]

dtgc ] (93) GRP Data tag group close

data tag group[133]

dtgo [ (91) GRP Data tag group open

data tag group[133]

ero & (38) CON LIT NMS Entity reference open

general entity reference[59]

etago </ (60 67) CON TAG GI End-tag open

end-tag[19]
empty end-tag[21]
unclosed end-tag[22]

grpc ) (41) GRP Group close

name token group[68]
name group[69]
ranked group[119]
model group[127]
data tag template group[135]

grpo ( (40) CTX GRP MD Group open

name token group[68]
name group[69]
ranked group[119]
model group[127]
data tag template group[135]

lit " (34) GRP LIT MD TAG Literal start or end

attribute value literal[34]
parameter literal[66]
system identifier[75]
minimum literal[76]

lita ' (39) GRP LIT MD TAG Literal start or end (alternative)

attribute value literal[34]
parameter literal[66]
system identifier[75]
minimum literal[76]

mdc > (62) CTX MD Markup declaration close

comment declaration[91]
marked section end[95]
entity declaration[101]
document type declaration[110]
element declaration[116]
attribute definition list declaration [141]
notation declaration[148]
short reference mapping declaration[150]
short reference use declaration[152]
link type declaration[154]
link set declaration[163]
ID link set declaration[168.1]
link set use declaration[169]
SGML declaration[171]
system declaration[200]

mdo <! (60 33) CON DSM DCL Markup declaration open

comment declaration[91]
marked section start[94]
entity declaration[101]
document type declaration[110]
element declaration[116]
attribute definition list declaration [141]
notation declaration[148]
short reference mapping declaration[150]
short reference use declaration[152]
link type declaration[154]
link set declaration[163]
ID link set declaration[168.1]
link set use declaration[169]
SGML declaration[171]
system declaration[200]

minus - (45) MD EX Exclusion

[123] start-tag minimization
[123] end-tag minimization
[123] exclusion

msc ]] (93 93) CON DSM MSE Marked section close

marked section end[95]

net / (47) CON TAG ELEM Null end-tag

net-enabling start-tag[18]
null end-tag [23]

opt ? (63) GRP Optional occurrence indicator

occurrence indicator[132]

or | (124) GRP Or connector

connector[131]
data tag template group [135]

pero % (37) DSM GRP LIT MD NMS Parameter entity reference open

parameter entity reference[60]
parameter entity name[104]

pic > (62) PI Processing instruction close

processing instruction[44]

pio <? (60 63) CON DSM Processing instruction open

processing instruction[44]

plus + (43) GRP MD EX Required and repeatable, inclusion

occurrence indicator[132]
inclusions[139]

refc ; (59) REF Reference close

reference end[61]

rep * (42) GRP Optional and repeatable

occurrence indicator[132]

rni # (35) GRP MD Reserved name indicator

general entity name[103]
primitive content token[129]
default value[147]
associated notation name[149.1]
map specification[153]
simple link specification[156]
implicit link specification[157]
link set name[164]
source element specification[165]
explicit link rule[166.1]
link set specification[170]

seq , (44) GRP Sequence connector

connector[131]
data tag group[133]
data tag pattern[134]

shortref various CON Short reference (see Figure 4)