<s>
An	O
aspect	O
of	O
a	O
program	O
is	O
a	O
feature	B-Architecture
linked	O
to	O
many	O
other	O
parts	O
of	O
the	O
program	O
,	O
but	O
which	O
is	O
not	O
related	O
to	O
the	O
program	O
's	O
primary	O
function	O
.	O
</s>
<s>
An	O
aspect	O
crosscuts	B-Application
the	O
program	O
's	O
core	O
concerns	O
,	O
therefore	O
violating	O
its	O
separation	O
of	O
concerns	O
that	O
tries	O
to	O
encapsulate	O
unrelated	O
functions	O
.	O
</s>
<s>
Isolating	O
such	O
aspects	O
as	O
logging	O
and	O
persistence	B-Application
from	O
business	B-Architecture
logic	I-Architecture
is	O
at	O
the	O
core	O
of	O
the	O
aspect-oriented	B-Architecture
programming	I-Architecture
(	O
AOP	O
)	O
paradigm	O
.	O
</s>
<s>
Aspect-orientation	B-Architecture
is	O
not	O
limited	O
to	O
programming	O
since	O
it	O
is	O
useful	O
to	O
identify	O
,	O
analyse	O
,	O
trace	O
and	O
modularise	O
concerns	O
through	O
requirements	O
elicitation	O
,	O
specification	O
and	O
design	O
.	O
</s>
<s>
One	O
view	O
of	O
aspect-oriented	B-Architecture
software	I-Architecture
development	I-Architecture
is	O
that	O
every	O
major	O
feature	B-Architecture
of	O
the	O
program	O
,	O
core	O
concern	O
(	O
business	B-Architecture
logic	I-Architecture
)	O
,	O
or	O
cross-cutting	B-Application
concern	I-Application
(	O
additional	O
features	O
)	O
,	O
is	O
an	O
aspect	O
,	O
and	O
by	O
weaving	B-Application
them	O
together	O
(	O
a	O
process	O
also	O
called	O
composition	O
)	O
,	O
one	O
finally	O
produces	O
a	O
whole	O
out	O
of	O
the	O
separate	O
aspects	O
.	O
</s>
<s>
This	O
approach	O
is	O
known	O
as	O
pure	O
aspect	B-Architecture
programming	I-Architecture
,	O
but	O
hybrid	O
approaches	O
are	O
more	O
commonly	O
used	O
.	O
</s>
