<s>
A	O
revision	B-Protocol
tag	I-Protocol
is	O
a	O
textual	O
label	O
that	O
can	O
be	O
associated	O
with	O
a	O
specific	O
revision	O
of	O
a	O
project	O
maintained	O
by	O
a	O
version	B-Architecture
control	I-Architecture
system	I-Architecture
.	O
</s>
<s>
This	O
allows	O
the	O
user	O
to	O
define	O
a	O
meaningful	O
name	O
to	O
be	O
given	O
to	O
a	O
particular	O
state	O
of	O
a	O
project	O
that	O
is	O
under	O
version	B-Architecture
control	I-Architecture
.	O
</s>
<s>
This	O
label	O
can	O
then	O
be	O
used	O
in	O
place	O
of	O
the	O
revision	O
identifier	O
for	O
commands	O
supported	O
by	O
the	O
version	B-Architecture
control	I-Architecture
system	I-Architecture
.	O
</s>
<s>
For	O
example	O
,	O
in	O
software	O
development	O
,	O
a	O
tag	B-General_Concept
may	O
be	O
used	O
to	O
identify	O
a	O
specific	O
release	O
of	O
the	O
software	O
such	O
as	O
"	O
version	O
1.2	O
"	O
.	O
</s>
