<s>
Generalized	B-Application
Markup	I-Application
Language	I-Application
(	O
GML	O
)	O
is	O
a	O
set	O
of	O
macros	O
that	O
implement	O
intent-based	O
(	O
procedural	O
)	O
markup	O
tags	B-General_Concept
for	O
the	O
IBM	O
text	B-General_Concept
formatter	I-General_Concept
,	O
SCRIPT	B-Application
.	O
</s>
<s>
SCRIPT/VS	B-Application
is	O
the	O
main	O
component	O
of	O
IBM	O
's	O
Document	B-Application
Composition	I-Application
Facility	I-Application
(	O
DCF	O
)	O
.	O
</s>
<s>
A	O
starter	O
set	O
of	O
tags	B-General_Concept
in	O
GML	O
is	O
provided	O
with	O
the	O
DCF	O
product	O
.	O
</s>
<s>
Using	O
GML	O
,	O
a	O
document	O
is	O
marked	O
up	O
with	O
tags	B-General_Concept
that	O
define	O
what	O
the	O
text	O
is	O
,	O
in	O
terms	O
of	O
paragraphs	O
,	O
headers	O
,	O
lists	O
,	O
tables	O
,	O
and	O
so	O
forth	O
.	O
</s>
<s>
The	O
document	O
can	O
then	O
be	O
automatically	O
formatted	O
for	O
various	O
devices	O
simply	O
by	O
specifying	O
a	O
profile	O
for	O
the	O
device	B-Device
.	O
</s>
<s>
For	O
example	O
,	O
it	O
is	O
possible	O
to	O
format	O
a	O
document	O
for	O
a	O
laser	O
printer	O
or	O
a	O
line	O
(	O
dot	O
matrix	O
)	O
printer	O
or	O
for	O
a	O
screen	O
simply	O
by	O
specifying	O
a	O
profile	O
for	O
the	O
device	B-Device
without	O
changing	O
the	O
document	O
itself	O
.	O
</s>
<s>
The	O
Standard	B-Language
Generalized	I-Language
Markup	I-Language
Language	I-Language
(	O
SGML	B-Language
)	O
,	O
an	O
ISO-standard	O
technology	O
for	O
defining	O
generalized	B-Application
markup	I-Application
languages	I-Application
for	O
documents	O
,	O
is	O
descended	O
from	O
GML	O
.	O
</s>
<s>
The	O
Extensible	B-Protocol
Markup	I-Protocol
Language	I-Protocol
(	O
XML	B-Protocol
)	O
was	O
initially	O
a	O
streamlined	O
and	O
simplified	O
development	O
of	O
SGML	B-Language
,	O
but	O
has	O
outgrown	O
its	O
parent	O
in	O
terms	O
of	O
worldwide	O
acceptance	O
and	O
support	O
.	O
</s>
<s>
:p	O
.Markup	O
minimization	O
(	O
later	O
generalized	O
and	O
formalized	O
in	O
SGML	B-Language
)	O
,	O
</s>
<s>
allowed	O
the	O
end-tags	O
to	O
be	O
omitted	O
for	O
the	O
"	O
h1	O
"	O
and	O
"	O
p	O
"	O
elements	O
.	O
</s>
<s>
During	O
the	O
early	O
1980s	O
,	O
Don	O
Williams	O
at	O
IBM	O
developed	O
DWScript	O
to	O
use	O
the	O
SCRIPT/VS	B-Application
on	O
the	O
IBM	O
PC	O
.	O
</s>
<s>
IBM	O
uses	O
GML	O
as	O
description	O
language	O
on	O
IBM	B-Application
i	I-Application
and	O
predecessors	O
for	O
objects	O
called	O
"	O
panel	O
groups	O
"	O
.	O
</s>
<s>
Panel	O
groups	O
can	O
present	O
just	O
formatted	O
help	O
text	O
to	O
the	O
user	O
when	O
pressing	O
the	O
help	O
key	O
(	O
often	O
F1	O
)	O
,	O
resemble	O
the	O
typical	O
IBM	B-Application
i	I-Application
menus	O
with	O
embedded	O
help	O
texts	O
,	O
or	O
complete	O
application	O
displays	O
with	O
input/output	O
fields	O
,	O
and	O
other	O
TUI	B-Application
elements	O
being	O
formatted	O
on	O
screen	O
according	O
to	O
IBM	B-General_Concept
CUA	I-General_Concept
Standards	I-General_Concept
.	O
</s>
