<s>
Event	B-General_Concept
condition	I-General_Concept
action	I-General_Concept
(	O
ECA	O
)	O
is	O
a	O
short-cut	O
for	O
referring	O
to	O
the	O
structure	O
of	O
active	O
rules	O
in	O
event	B-Application
driven	I-Application
architecture	I-Application
and	O
active	O
database	O
systems	O
.	O
</s>
<s>
ECA	O
rules	O
can	O
also	O
be	O
used	O
in	O
rule	O
engines	O
that	O
use	O
variants	O
of	O
the	O
Rete	B-Algorithm
algorithm	I-Algorithm
for	O
rule	O
processing	O
.	O
</s>
