<s>
is	O
an	O
open-source	B-License
model	I-License
transformation	O
framework	O
based	O
on	O
the	O
Eclipse	B-Language
Modeling	I-Language
Framework	I-Language
(	O
EMF	O
)	O
and	O
hosted	O
by	O
the	B-Application
Eclipse	I-Application
Foundation	I-Application
.	O
</s>
<s>
VIATRA	B-Application
supports	O
the	O
development	O
of	O
model	B-Language
transformations	I-Language
with	O
specific	O
focus	O
on	O
event-driven	O
,	O
</s>
<s>
Earlier	O
versions	O
of	O
the	O
framework	O
have	O
been	O
intensively	O
used	O
for	O
providing	O
tool	O
support	O
for	O
developing	O
and	O
verifying	O
critical	O
embedded	B-Architecture
systems	I-Architecture
in	O
numerous	O
European	O
research	O
projects	O
such	O
as	O
DECOS	O
,	O
MOGENTES	O
,	O
INDEXYS	O
and	O
SecureChange	O
.	O
</s>
<s>
As	O
a	O
major	O
industrial	O
application	O
of	O
VIATRA	B-Application
,	O
it	O
is	O
utilized	O
as	O
the	O
underlying	O
model	O
querying	O
and	O
transformation	O
engine	O
of	O
the	O
IncQuery	O
Suite	O
.	O
</s>
<s>
Thus	O
,	O
VIATRA	B-Application
is	O
a	O
key	O
technical	O
component	O
in	O
several	O
industrial	O
collaborations	O
around	O
model-based	B-Language
systems	I-Language
engineering	I-Language
(	O
MBSE	B-Language
)	O
,	O
fostering	O
innovative	O
systems	O
engineering	O
practices	O
in	O
domains	O
like	O
aerospace	O
,	O
manufacturing	O
,	O
industrial	O
automation	O
and	O
automotive	O
.	O
</s>
<s>
Furthermore	O
,	O
via	O
the	O
applications	O
of	O
the	O
IncQuery	O
Suite	O
,	O
VIATRA	B-Application
serves	O
as	O
the	O
foundation	O
for	O
model-based	O
endeavors	O
of	O
ongoing	O
,	O
large-scale	O
European	O
industrial	O
digitalization	O
endeavors	O
,	O
such	O
as	O
the	O
Arrowhead	O
Tools	O
and	O
the	O
Embrace	O
projects	O
.	O
</s>
<s>
VIATRA	B-Application
is	O
well	O
integrated	O
with	O
Eclipse	O
Modeling	O
tools	O
.	O
</s>
<s>
However	O
,	O
VIATRA	B-Application
works	O
outside	O
the	O
Eclipse	O
environment	O
as	O
well	O
,	O
as	O
demonstrated	O
by	O
the	O
IncA	O
project	O
using	O
the	O
JetBrains	B-Application
MPS	I-Application
platform	O
.	O
</s>
<s>
VIATRA	B-Application
provides	O
the	O
following	O
main	O
services	O
:	O
</s>
<s>
The	O
current	O
VIATRA	B-Application
project	O
is	O
a	O
full	O
rewrite	O
of	O
the	O
previous	O
VIATRA2	O
framework	O
,	O
coming	O
with	O
full	O
compatibility	O
and	O
support	O
for	O
EMF	O
models	O
.	O
</s>
<s>
As	O
for	O
applications	O
of	O
the	O
earlier	O
VIATRA2	O
framework	O
,	O
it	O
served	O
as	O
the	O
underlying	O
model	B-Language
transformation	I-Language
engine	O
of	O
the	O
DECOS	O
European	O
IP	O
in	O
the	O
field	O
of	O
dependable	O
embedded	B-Architecture
systems	I-Architecture
.	O
</s>
<s>
Furthermore	O
,	O
a	O
traditional	O
application	O
area	O
for	O
VIATRA2	O
–	O
starting	O
as	O
early	O
as	O
1998	O
–	O
was	O
to	O
support	O
the	O
analysis	O
of	O
system	O
models	O
taken	O
from	O
various	O
application	O
areas	O
(	O
safety-critical	O
and/or	O
embedded	B-Architecture
systems	I-Architecture
,	O
robust	O
e-business	B-Application
applications	O
,	O
middleware	B-General_Concept
,	O
service-oriented	O
architecture	O
)	O
described	O
using	O
various	O
modeling	O
languages	O
(	O
SysML	O
,	O
UML	O
,	O
BPMN	O
,	O
etc	O
.	O
)	O
</s>
<s>
Such	O
a	O
model	O
analysis	O
typically	O
also	O
includes	O
the	O
verification	B-Application
and	I-Application
validation	I-Application
,	O
the	O
testing	O
,	O
the	O
safety	O
and	O
security	O
analysis	O
as	O
well	O
as	O
the	O
early	O
assessment	O
of	O
non-functional	O
characteristics	O
(	O
such	O
as	O
reliability	O
,	O
availability	O
,	O
responsiveness	B-Application
,	O
throughput	O
,	O
etc	O
.	O
)	O
</s>
<s>
These	O
use-cases	O
and	O
application	O
fields	O
still	O
constitute	O
focal	O
areas	O
for	O
VIATRA	B-Application
,	O
mostly	O
addressed	O
via	O
the	O
IncQuery	O
Suite	O
as	O
an	O
interface	O
on	O
the	O
user	O
's	O
end	O
.	O
</s>
<s>
Since	O
precise	O
model-based	O
systems	O
development	O
is	O
the	O
primary	O
application	O
area	O
of	O
VIATRA	B-Application
,	O
it	O
necessitates	O
that	O
(	O
i	O
)	O
the	O
model	B-Language
transformations	I-Language
are	O
specified	O
in	O
a	O
mathematically	O
precise	O
way	O
,	O
and	O
(	O
ii	O
)	O
these	O
transformations	O
are	O
automated	O
so	O
that	O
the	O
target	O
mathematical	O
models	O
can	O
be	O
derived	O
fully	O
automatically	O
.	O
</s>
<s>
To	O
achieve	O
this	O
,	O
VIATRA	B-Application
relies	O
upon	O
a	O
mathematically	O
precise	O
rule-based	O
specification	O
formalism	O
,	O
namely	O
,	O
graph	B-Application
transformation	I-Application
(	O
GT	O
)	O
.	O
</s>
<s>
VIATRA	B-Application
aims	O
at	O
invisible	O
formal	O
methods	O
:	O
here	O
,	O
formal	O
details	O
are	O
hidden	O
by	O
automated	O
model	B-Language
transformations	I-Language
projecting	O
system	O
models	O
into	O
various	O
mathematical	O
domains	O
(	O
and	O
,	O
preferably	O
,	O
vice	O
versa	O
)	O
.	O
</s>
<s>
The	O
basic	O
concept	O
in	O
defining	O
model	B-Language
transformations	I-Language
within	O
VIATRA	B-Application
is	O
the	O
(	O
graph	O
)	O
pattern	O
.	O
</s>
<s>
Patterns	O
can	O
be	O
matched	O
on	O
certain	O
model	O
instances	O
,	O
and	O
upon	O
successful	O
pattern	O
matching	O
,	O
elementary	O
model	O
manipulation	O
is	O
specified	O
by	O
graph	B-Application
transformation	I-Application
rules	O
.	O
</s>
<s>
Like	O
OCL	B-Language
,	O
graph	B-Application
transformation	I-Application
rules	O
describe	O
pre	O
-	O
and	O
postconditions	O
to	O
the	O
transformations	O
,	O
but	O
graph	B-Application
transformation	I-Application
rules	O
are	O
guaranteed	O
to	O
be	O
executable	O
,	O
which	O
is	O
a	O
main	O
conceptual	O
difference	O
.	O
</s>
<s>
In	O
particular	O
,	O
as	O
reactive	O
,	O
event-driven	O
transformations	O
are	O
the	O
current	O
focus	O
of	O
VIATRA	B-Application
,	O
VIATRA	B-Application
includes	O
a	O
rule	O
execution	O
engine	O
which	O
monitors	O
changes	O
(	O
interpreted	O
as	O
events	O
)	O
in	O
the	O
model	O
,	O
and	O
fires	O
a	O
rule	O
whenever	O
a	O
change	O
led	O
to	O
the	O
fulfillment	O
of	O
the	O
precondition	O
for	O
that	O
rule	O
(	O
and	O
,	O
potentially	O
,	O
if	O
some	O
further	O
control	O
conditions	O
are	O
also	O
met	O
)	O
.	O
</s>
