<s>
HyTime	B-Language
(	O
Hypermedia/Time	B-Language
-based	I-Language
Structuring	I-Language
Language	I-Language
)	O
is	O
a	O
markup	O
language	O
that	O
is	O
an	O
application	O
of	O
SGML	B-Language
.	O
</s>
<s>
HyTime	B-Language
defines	O
a	O
set	O
of	O
hypertext-oriented	O
element	O
types	O
that	O
,	O
in	O
effect	O
,	O
supplement	O
SGML	B-Language
and	O
allow	O
SGML	B-Language
document	O
authors	O
to	O
build	O
hypertext	O
and	O
multimedia	O
presentations	O
in	O
a	O
standardized	O
way	O
.	O
</s>
<s>
HyTime	B-Language
is	O
an	O
international	O
standard	O
published	O
by	O
the	O
ISO	O
and	O
IEC	O
.	O
</s>
<s>
Some	O
of	O
the	O
concepts	O
formalized	O
in	O
HyTime	B-Language
were	O
later	O
incorporated	O
into	O
HTML	B-Language
and	O
XML	B-Protocol
:	O
</s>
<s>
HTML	B-Language
is	O
an	O
application	O
of	O
SGML	B-Language
for	O
hypertext	O
document	O
presentations	O
,	O
that	O
assigns	O
specific	O
semantics	O
and	O
processing	O
expectations	O
to	O
a	O
fixed	O
set	O
of	O
element	O
types	O
.	O
</s>
<s>
XML	B-Protocol
defines	O
a	O
simplified	O
subset	O
of	O
SGML	B-Language
that	O
focuses	O
on	O
providing	O
an	O
open	O
vocabulary	O
of	O
element	O
types	O
for	O
data	B-Application
modeling	I-Application
and	O
establishes	O
precise	O
expectations	O
for	O
how	O
the	O
marked-up	O
data	O
is	O
read	O
and	O
subsequently	O
fed	O
to	O
another	O
software	O
application	O
for	O
further	O
processing	O
,	O
but	O
does	O
not	O
assign	O
semantics	O
to	O
the	O
element	O
types	O
or	O
establish	O
expectations	O
for	O
how	O
the	O
data	O
is	O
processed	O
.	O
</s>
<s>
XLink	O
was	O
intended	O
as	O
a	O
simplified	O
version	O
of	O
HyTime	B-Language
for	O
use	O
in	O
the	O
XML	B-Protocol
world	O
,	O
but	O
has	O
not	O
seen	O
much	O
adoption	O
.	O
</s>
<s>
Work	O
on	O
applying	O
HyTime	B-Language
to	O
back-of-book	O
indexes	O
eventually	O
led	O
to	O
the	O
development	O
of	O
Topic	B-Application
Maps	I-Application
,	O
which	O
eventually	O
became	O
far	O
more	O
successful	O
in	O
its	O
own	O
right	O
than	O
HyTime	B-Language
ever	O
was	O
.	O
</s>
<s>
The	O
HyTime	B-Language
standard	O
itself	O
is	O
ISO/IEC	O
10744	O
,	O
first	O
published	O
in	O
1992	O
and	O
available	O
from	O
the	O
International	O
Organization	O
for	O
Standardization	O
.	O
</s>
