<s>
Metadatabase	B-General_Concept
is	O
a	O
database	B-General_Concept
model	I-General_Concept
for	O
(	O
1	O
)	O
metadata	O
management	O
,	O
(	O
2	O
)	O
global	O
query	O
of	O
independent	O
databases	O
,	O
and	O
(	O
3	O
)	O
distributed	B-General_Concept
data	I-General_Concept
processing	I-General_Concept
.	O
</s>
<s>
The	O
word	O
metadatabase	B-General_Concept
is	O
an	O
addition	O
to	O
the	O
dictionary	O
.	O
</s>
<s>
However	O
,	O
in	O
this	O
technology	O
,	O
the	O
concept	O
of	O
metadata	O
is	O
extended	O
to	O
also	O
include	O
such	O
data	O
and	O
knowledge	O
representation	O
as	O
information	B-Application
models	I-Application
(	O
e.g.	O
,	O
relations	O
,	O
entities-relationships	O
,	O
and	O
objects	O
)	O
,	O
application	O
logic	O
(	O
e.g.	O
,	O
production	O
rules	O
)	O
,	O
and	O
analytic	O
models	O
(	O
e.g.	O
,	O
simulation	O
,	O
optimization	O
,	O
and	O
mathematical	O
algorithms	O
)	O
.	O
</s>
<s>
These	O
classes	O
of	O
metadata	O
are	O
integrated	O
with	O
some	O
modeling	O
ontology	B-Language
to	O
give	O
rise	O
to	O
a	O
stable	O
set	O
of	O
meta-relations	O
(	O
tables	O
of	O
metadata	O
)	O
.	O
</s>
<s>
As	O
such	O
,	O
models	O
are	O
inserted	O
,	O
retrieved	O
,	O
updated	O
,	O
and	O
deleted	O
in	O
the	O
same	O
manner	O
as	O
ordinary	O
data	O
do	O
in	O
an	O
ordinary	O
(	O
relational	B-Application
)	O
database	O
.	O
</s>
<s>
Users	O
will	O
also	O
formulate	O
global	O
queries	O
and	O
requests	O
for	O
processing	O
of	O
local	O
databases	O
through	O
the	O
Metadatabase	B-General_Concept
,	O
using	O
the	O
globally	O
integrated	O
metadata	O
.	O
</s>
<s>
The	O
Metadatabase	B-General_Concept
structure	O
can	O
be	O
implemented	O
in	O
any	O
open	O
technology	O
for	O
relational	B-Application
databases	I-Application
.	O
</s>
<s>
The	O
Metadatabase	B-General_Concept
technology	O
is	O
developed	O
at	O
Rensselaer	O
Polytechnic	O
Institute	O
at	O
Troy	O
,	O
New	O
York	O
,	O
by	O
a	O
group	O
of	O
faculty	O
and	O
students	O
(	O
see	O
the	O
references	O
at	O
the	O
end	O
of	O
the	O
article	O
)	O
,	O
starting	O
in	O
late	O
1980s	O
.	O
</s>
<s>
At	O
the	O
level	O
of	O
particular	O
design	O
,	O
its	O
openness	O
and	O
scalability	B-Architecture
is	O
tied	O
to	O
that	O
of	O
the	O
particular	O
ontology	B-Language
proposed	O
:	O
It	O
requires	O
reverse-representation	O
of	O
the	O
application	O
models	O
in	O
order	O
to	O
save	O
them	O
into	O
the	O
meta-relations	O
.	O
</s>
<s>
In	O
theory	O
,	O
the	O
ontology	B-Language
is	O
neutral	O
,	O
and	O
it	O
has	O
been	O
proven	O
in	O
some	O
industrial	O
applications	O
.	O
</s>
<s>
The	O
requirement	O
of	O
reverse-representation	O
is	O
common	O
to	O
any	O
global	O
information	B-General_Concept
integration	I-General_Concept
technology	O
.	O
</s>
<s>
A	O
way	O
to	O
facilitate	O
it	O
in	O
the	O
Metadatabase	B-General_Concept
approach	O
is	O
to	O
distribute	O
a	O
core	O
portion	O
of	O
it	O
at	O
each	O
local	O
site	O
,	O
to	O
allow	O
for	O
peer-to-peer	O
translation	O
on	O
the	O
fly	O
.	O
</s>
