<s>
there	O
are	O
relational	B-Application
classification	I-Application
rules	O
(	O
relational	B-Application
classification	I-Application
)	O
,	O
relational	O
regression	B-Algorithm
tree	I-Algorithm
,	O
and	O
relational	O
association	B-Algorithm
rules	I-Algorithm
.	O
</s>
<s>
There	O
are	O
several	O
approaches	O
to	O
relational	B-Application
data	I-Application
mining	I-Application
:	O
</s>
<s>
Multi-Relation	O
Association	B-Algorithm
Rules	I-Algorithm
:	O
Multi-Relation	O
Association	B-Algorithm
Rules	I-Algorithm
(	O
MRAR	O
)	O
is	O
a	O
new	O
class	O
of	O
association	B-Algorithm
rules	I-Algorithm
which	O
in	O
contrast	O
to	O
primitive	O
,	O
simple	O
and	O
even	O
multi-relational	O
association	B-Algorithm
rules	I-Algorithm
(	O
that	O
are	O
usually	O
extracted	O
from	O
multi-relational	O
databases	O
)	O
,	O
each	O
rule	O
item	O
consists	O
of	O
one	O
entity	O
but	O
several	O
relations	O
.	O
</s>
<s>
Such	O
association	B-Algorithm
rules	I-Algorithm
are	O
extractable	O
from	O
RDBMS	O
data	O
or	O
semantic	O
web	O
data	O
.	O
</s>
<s>
:	O
a	O
Data	B-Application
Mining	I-Application
environment	O
for	O
analysing	O
large	O
relational	O
databases	O
based	O
on	O
a	O
multi-relational	O
data	B-Application
mining	I-Application
engine	O
.	O
</s>
