<s>
Source	B-Language
tracking	I-Language
pertains	O
to	O
the	O
ability	O
of	O
some	O
hypertext	O
systems	O
to	O
rigorously	O
track	O
the	O
exact	O
source	O
of	O
every	O
document	O
or	O
partial	O
document	O
included	O
in	O
the	O
system	O
;	O
that	O
is	O
,	O
they	O
remember	O
who	O
entered	O
the	O
information	O
,	O
when	O
it	O
was	O
entered	O
,	O
when	O
it	O
was	O
updated	O
and	O
by	O
whom	O
,	O
and	O
so	O
on	O
.	O
</s>
<s>
Present	O
HTML	B-Language
and	O
HTTP	B-Protocol
do	O
not	O
have	O
this	O
feature	O
,	O
but	O
certain	O
systems	O
on	O
the	O
World	O
Wide	O
Web	O
(	O
such	O
as	O
WikiWiki	B-Protocol
and	O
Everything	O
Engine	O
)	O
may	O
have	O
limited	O
versions	O
of	O
the	O
capability	O
.	O
</s>
<s>
One	O
application	O
of	O
digital	O
watermarking	O
is	O
source	B-Language
tracking	I-Language
.	O
</s>
