<s>
Document	B-Application
Content	I-Application
Architecture	I-Application
,	O
or	O
DCA	O
for	O
short	O
,	O
is	O
a	O
standard	O
developed	O
by	O
IBM	O
for	O
text	O
documents	O
in	O
the	O
early	O
1980s	O
.	O
</s>
<s>
DCA	O
was	O
used	O
on	O
mainframe	B-Architecture
and	O
IBM	B-Application
i	I-Application
systems	O
,	O
and	O
formed	O
the	O
basis	O
of	O
DisplayWrite	B-Protocol
's	O
file	O
format	O
.	O
</s>
<s>
DCA	O
was	O
later	O
extended	O
as	O
MO:DCA	O
(	O
Mixed	O
Object	O
Document	B-Application
Content	I-Application
Architecture	I-Application
)	O
,	O
which	O
added	O
embedded	O
data	B-General_Concept
files	I-General_Concept
.	O
</s>
<s>
The	O
original	O
purpose	O
of	O
DCA	O
was	O
to	O
provide	O
a	O
common	O
document	O
format	O
that	O
could	O
be	O
used	O
across	O
multiple	O
IBM	O
word	O
processing	O
platforms	O
,	O
such	O
as	O
the	O
IBM	B-Device
PC	I-Device
,	O
IBM	B-Device
mainframes	I-Device
,	O
the	O
Displaywriter	B-Protocol
System	I-Protocol
,	O
and	O
the	O
IBM	B-Device
5520	I-Device
Administrative	I-Device
System	I-Device
.	O
</s>
<s>
A	O
variation	O
of	O
GOCA	O
,	O
AFP	O
GOCA	O
,	O
is	O
used	O
in	O
Advanced	B-Application
Function	I-Application
Presentation	I-Application
environments	O
.	O
</s>
<s>
It	O
was	O
used	O
by	O
IBM	B-Protocol
DisplayWrite	I-Protocol
4	O
and	O
5	O
word	B-General_Concept
processors	I-General_Concept
on	O
System/360	B-Application
and	O
370	O
mainframe	B-Architecture
computers	I-Architecture
,	O
and	O
OfficeVision/400	B-Application
to	O
allow	O
transfer	O
of	O
formatted	O
documents	O
to	O
other	O
systems	O
.	O
</s>
<s>
This	O
decision	O
was	O
based	O
in	O
part	O
on	O
the	O
experience	O
gained	O
over	O
the	O
acceptance	O
of	O
GML	O
into	O
an	O
international	O
SGML	B-Language
standard	O
.	O
</s>
<s>
SGML	B-Language
standardization	O
had	O
taken	O
many	O
years	O
to	O
develop	O
.	O
</s>
<s>
IBM	O
's	O
work	O
with	O
document	O
content	O
had	O
been	O
pushed	O
by	O
the	O
needs	O
of	O
main	B-Architecture
frame	I-Architecture
computers	I-Architecture
where	O
GML	O
and	O
DCA	O
were	O
in	O
use	O
,	O
but	O
that	O
experience	O
was	O
pointing	O
to	O
a	O
need	O
for	O
standardized	O
component	O
architectures	O
for	O
revisable	O
and	O
non-revisable	O
text	O
in	O
particular	O
.	O
</s>
<s>
The	O
PC	O
world	O
had	O
decided	O
on	O
HTML	B-Language
(	O
believed	O
to	O
be	O
an	O
application	O
of	O
the	O
SGML	B-Language
international	O
standard	O
)	O
and	O
used	O
portions	O
of	O
it	O
for	O
their	O
purposes	O
.	O
</s>
<s>
Even	O
though	O
the	O
SGML	B-Language
standard	O
was	O
available	O
,	O
it	O
was	O
impractical	O
to	O
use	O
the	O
full	O
SGML	B-Language
parser	O
implementation	O
,	O
so	O
a	O
potential	O
subset	O
of	O
it	O
became	O
the	O
de	O
facto	O
standard	O
for	O
revisable	O
text	O
used	O
today	O
in	O
the	O
PC	O
arena	O
.	O
</s>
<s>
At	O
about	O
the	O
same	O
time	O
,	O
Adobe	O
Systems	O
designed	O
and	O
produced	O
the	O
printable	O
document	O
encoding	O
PDF	B-Application
,	O
which	O
has	O
become	O
the	O
standard	O
for	O
PC-produced	O
printable	O
documents	O
.	O
</s>
<s>
The	O
output	O
of	O
the	O
word	O
processing	O
software	O
is	O
'	O
printed	O
 '	O
into	O
the	O
PDF	B-Application
format	I-Application
provided	O
by	O
the	O
most	O
used	O
presentation	O
product	O
.	O
</s>
<s>
For	O
example	O
,	O
Microsoft	O
Word	O
provides	O
a	O
printer	O
selection	O
'	O
Microsoft	O
Print	O
to	O
PDF	B-Application
 '	O
in	O
order	O
to	O
produce	O
the	O
requisite	O
output	O
for	O
a	O
PDF	B-Application
document	O
.	O
</s>
