<s>
Ontology	B-General_Concept
merging	I-General_Concept
defines	O
the	O
act	O
of	O
bringing	O
together	O
two	O
conceptually	O
divergent	O
ontologies	O
or	O
the	O
instance	O
data	O
associated	O
to	O
two	O
ontologies	O
.	O
</s>
<s>
This	O
is	O
similar	O
to	O
work	O
in	O
database	O
merging	O
(	O
schema	B-General_Concept
matching	I-General_Concept
)	O
.	O
</s>
<s>
Manual	O
ontology	B-General_Concept
merging	I-General_Concept
although	O
ideal	O
is	O
extremely	O
labour-intensive	O
and	O
current	O
research	O
attempts	O
to	O
find	O
semi	O
or	O
entirely	O
automated	O
techniques	O
to	O
merge	O
ontologies	O
.	O
</s>
<s>
These	O
techniques	O
are	O
similar	O
to	O
those	O
used	O
in	O
information	B-General_Concept
integration	I-General_Concept
employing	O
string	O
metrics	O
from	O
open	B-License
source	I-License
similarity	O
libraries	O
.	O
</s>
