<s>
The	O
enhanced	O
entity	B-Architecture
–	I-Architecture
relationship	I-Architecture
(	O
EER	O
)	O
model	O
(	O
or	O
extended	B-Application
entity	I-Application
–	I-Application
relationship	I-Application
model	I-Application
)	O
in	O
computer	O
science	O
is	O
a	O
high-level	O
or	O
conceptual	B-Application
data	I-Application
model	I-Application
incorporating	O
extensions	O
to	O
the	O
original	O
entity	B-Architecture
–	I-Architecture
relationship	I-Architecture
(	O
ER	O
)	O
model	O
,	O
used	O
in	O
the	O
design	O
of	O
databases	O
.	O
</s>
<s>
It	O
was	O
developed	O
to	O
reflect	O
more	O
precisely	O
the	O
properties	O
and	O
constraints	O
that	O
are	O
found	O
in	O
more	O
complex	O
databases	O
,	O
such	O
as	O
in	O
engineering	O
design	O
and	O
manufacturing	O
(	O
CAD/CAM	O
)	O
,	O
telecommunications	O
,	O
complex	O
software	O
systems	O
and	O
geographic	B-Application
information	I-Application
systems	I-Application
(	O
GIS	B-Application
)	O
.	O
</s>
<s>
The	O
EER	B-Application
model	I-Application
includes	O
all	O
of	O
the	O
concepts	O
introduced	O
by	O
the	O
ER	B-Architecture
model	I-Architecture
.	O
</s>
<s>
Additionally	O
it	O
includes	O
the	O
concepts	O
of	O
a	O
subclass	O
and	O
superclass	O
(	O
Is-a	O
)	O
,	O
along	O
with	O
the	O
concepts	O
of	O
specialization	O
and	O
generalization	B-Algorithm
.	O
</s>
<s>
EER	B-Application
model	I-Application
also	O
includes	O
EER	O
diagrams	O
that	O
are	O
conceptual	B-Application
models	O
that	O
accurately	O
represent	O
the	O
requirements	O
of	O
complex	O
databases	O
.	O
</s>
<s>
This	O
property	O
is	O
called	O
the	O
attribute	B-General_Concept
and	O
relationship	O
inheritance	O
.	O
</s>
<s>
The	O
MySQL	B-Language
Workbench	I-Language
offers	O
creating	O
,	O
editing	O
and	O
exporting	O
EER	B-Application
Models	I-Application
.	O
</s>
<s>
Skipper	B-Language
allows	O
users	O
to	O
create	O
,	O
import	O
and	O
export	O
from	O
ORM	O
schema	O
definitions	O
to	O
editable	O
EER	B-Application
models	I-Application
.	O
</s>
<s>
SAP	O
PowerDesigner	B-Application
is	O
a	O
complex	O
tool	O
for	O
modelling	O
and	O
transforming	O
different	O
models	O
.	O
</s>
