<s>
Attribute-oriented	B-Application
programming	I-Application
(	O
@OP	B-Application
)	O
is	O
a	O
technique	O
for	O
embedding	O
metadata	O
,	O
namely	O
attributes	B-General_Concept
,	O
within	O
program	O
code	O
.	O
</s>
<s>
With	O
the	O
inclusion	O
of	O
Metadata	B-Language
Facility	I-Language
for	I-Language
Java	I-Language
(	O
JSR-175	B-Language
)	O
into	O
the	O
J2SE	B-Language
5.0	O
release	O
it	O
is	O
possible	O
to	O
utilize	O
attribute-oriented	B-Application
programming	I-Application
right	O
out	O
of	O
the	O
box	O
.	O
</s>
<s>
XDoclet	B-Language
library	O
makes	O
it	O
possible	O
to	O
use	O
attribute-oriented	B-Application
programming	I-Application
approach	O
in	O
earlier	O
versions	O
of	O
Java	O
.	O
</s>
<s>
The	O
C#	O
language	O
has	O
supported	O
attributes	B-General_Concept
from	O
its	O
very	O
first	O
release	O
.	O
</s>
<s>
These	O
attributes	B-General_Concept
was	O
used	O
to	O
give	O
run-time	O
information	O
and	O
are	O
not	O
used	O
by	O
a	O
preprocessor	O
.	O
</s>
<s>
Currently	O
with	O
source	O
generators	O
,	O
you	O
can	O
use	O
attributes	B-General_Concept
to	O
drive	O
generation	O
of	O
additional	O
code	O
at	O
compile-time	O
.	O
</s>
<s>
The	O
Unified	B-Language
Modeling	I-Language
Language	I-Language
(	O
UML	B-Language
)	O
supports	O
a	O
kind	O
of	O
attribute	O
called	O
stereotypes	B-Language
.	O
</s>
<s>
The	O
Hack	B-Language
programming	I-Language
language	I-Language
supports	O
attributes	B-General_Concept
.	O
</s>
<s>
Attributes	B-General_Concept
can	O
be	O
attached	O
to	O
various	O
program	O
entities	O
,	O
and	O
information	O
about	O
those	O
attributes	B-General_Concept
can	O
be	O
retrieved	O
at	O
run-time	O
via	O
reflection	O
.	O
</s>
