<s>
DotGNU	B-Application
is	O
a	O
decommissioned	O
part	O
of	O
the	B-Application
GNU	I-Application
Project	I-Application
that	O
started	O
in	O
January	O
2001	O
.	O
</s>
<s>
DotGNU	B-Application
aims	O
to	O
provide	O
a	O
free	B-Application
software	I-Application
replacement	O
for	O
Microsoft	B-Application
's	I-Application
.NET	I-Application
Framework	I-Application
by	O
Free	B-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
Other	O
goals	O
of	O
the	O
project	O
are	O
better	O
support	O
for	O
non-Windows	O
platforms	B-Device
and	O
support	O
for	O
more	O
processors	O
.	O
</s>
<s>
The	O
main	O
goal	O
of	O
the	O
DotGNU	B-Application
project	O
code	O
base	O
was	O
to	O
provide	O
a	O
class	O
library	B-Library
that	O
is	O
100%	O
Common	O
Language	O
Specification	O
(	O
CLS	O
)	O
compliant	O
.	O
</s>
<s>
DotGNU	B-Application
Portable.NET	B-Application
,	O
an	O
implementation	O
of	O
the	O
ECMA-335	O
Common	O
Language	O
Infrastructure	O
(	O
CLI	O
)	O
,	O
includes	O
software	O
to	O
compile	O
and	O
run	O
Visual	B-Language
Basic	I-Language
.NET	I-Language
,	O
C#	B-Application
,	O
and	O
C	B-Language
applications	O
that	O
use	O
the	O
.NET	B-Application
base	O
class	O
libraries	O
,	O
XML	O
,	O
and	O
Windows	B-Application
Forms	I-Application
.	O
</s>
<s>
Portable.NET	B-Application
claims	O
to	O
support	O
various	O
instruction	B-General_Concept
set	I-General_Concept
architectures	I-General_Concept
including	O
x86	B-Operating_System
,	O
PPC	B-Architecture
,	O
ARM	O
,	O
and	O
SPARC	B-Architecture
.	O
</s>
<s>
DotGNU	B-Application
Execution	O
Environment	O
(	O
DGEE	O
)	O
is	O
a	O
web	O
service	O
server	O
.	O
</s>
<s>
The	O
libJIT	O
just-in-time	O
compilation	O
library	B-Library
is	O
a	O
library	B-Library
for	O
development	O
of	O
advanced	O
just-in-time	O
compilation	O
in	O
virtual	B-Architecture
machine	I-Architecture
implementations	O
,	O
dynamic	B-Language
programming	I-Language
languages	I-Language
,	O
and	O
scripting	B-Language
languages	I-Language
.	O
</s>
<s>
It	O
implements	O
an	O
intermediate	B-Application
representation	I-Application
based	O
on	O
three-address	B-Application
code	I-Application
,	O
in	O
which	O
variables	O
are	O
kept	O
in	O
static	O
single	O
assignment	O
form	O
.	O
</s>
<s>
libJIT	O
has	O
also	O
seen	O
some	O
use	O
in	O
other	O
open	O
source	O
projects	O
,	O
including	O
GNU	B-Application
Emacs	I-Application
ILDJIT	O
and	O
HornetsEye	O
.	O
</s>
<s>
The	O
Portable	O
.NET	B-Application
class	O
library	B-Library
seeks	O
to	O
provide	O
facilities	O
for	O
application	O
development	O
.	O
</s>
<s>
These	O
are	O
primarily	O
written	O
in	O
C#	B-Application
,	O
but	O
because	O
of	O
the	O
Common	O
Language	O
Specification	O
they	O
can	O
be	O
used	O
by	O
any	O
.NET	B-Application
language	O
.	O
</s>
<s>
Like	O
.NET	B-Application
,	O
the	O
class	O
library	B-Library
is	O
structured	O
into	O
Namespaces	O
and	O
Assemblies	O
.	O
</s>
<s>
It	O
has	O
additional	O
top-level	O
namespaces	O
including	O
Accessibility	O
and	O
DotGNU	B-Application
.	O
</s>
<s>
In	O
a	O
typical	O
operation	O
,	O
the	O
Portable	O
.NET	B-Application
compiler	O
generates	O
a	O
Common	O
Language	O
Specification	O
(	O
CLS	O
)	O
image	O
,	O
as	O
specified	O
in	O
chapter	O
6	O
of	O
ECMA-335	O
,	O
and	O
the	O
Portable	O
.NET	B-Application
runtime	O
takes	O
this	O
image	O
and	O
runs	O
it	O
.	O
</s>
<s>
DotGNU	B-Application
points	O
out	O
that	O
it	O
is	O
Free	B-Application
Software	I-Application
,	O
and	O
it	O
sets	O
out	O
to	O
ensure	O
that	O
all	O
aspects	O
of	O
DotGNU	B-Application
minimize	O
dependence	O
on	O
proprietary	O
components	O
,	O
such	O
as	O
calls	O
to	O
Microsoft	B-Application
Windows	I-Application
 '	O
GUI	O
code	O
.	O
</s>
<s>
DotGNU	B-Application
was	O
one	O
of	O
the	O
High	O
Priority	O
Free	B-Application
Software	I-Application
Projects	O
from	O
till	O
.	O
</s>
<s>
DotGNU	B-Application
's	O
implementation	O
of	O
those	O
components	O
of	O
the	O
.NET	B-Application
stack	O
not	O
submitted	O
to	O
the	O
ECMA	O
for	O
standardization	O
has	O
been	O
the	O
source	O
of	O
patent	O
violation	O
concerns	O
for	O
much	O
of	O
the	O
life	O
of	O
the	O
project	O
.	O
</s>
<s>
In	O
particular	O
,	O
discussion	O
has	O
taken	O
place	O
about	O
whether	O
Microsoft	O
could	O
destroy	O
the	O
DotGNU	B-Application
project	O
through	O
patent	O
suits	O
.	O
</s>
<s>
The	O
concerns	O
primarily	O
relate	O
to	O
technologies	O
developed	O
by	O
Microsoft	O
on	O
top	O
of	O
the	O
.NET	B-Application
Framework	I-Application
,	O
such	O
as	O
ASP.NET	B-Application
,	O
ADO.NET	B-Device
,	O
and	O
Windows	B-Application
Forms	I-Application
(	O
see	O
Non	O
standardized	O
namespaces	O
)	O
,	O
i.e.	O
</s>
<s>
parts	O
composing	O
DotGNU	B-Application
's	O
Windows	B-Application
compatibility	O
stack	O
.	O
</s>
<s>
These	O
technologies	O
are	O
today	O
not	O
fully	O
implemented	O
in	O
DotGNU	B-Application
and	O
are	O
not	O
required	O
for	O
developing	O
DotGNU-applications	O
.	O
</s>
<s>
In	O
2009	O
,	O
Microsoft	O
released	O
.NET	B-Application
Micro	I-Application
Framework	I-Application
under	O
Apache	O
License	O
,	O
Version	O
2.0	O
,	O
which	O
includes	O
a	O
patent	O
grant	O
.	O
</s>
<s>
However	O
,	O
the	O
.NET	B-Application
Micro	I-Application
Framework	I-Application
is	O
a	O
reimplementation	O
of	O
the	O
CLR	O
and	O
limited	O
subset	O
of	O
the	O
base	O
class	O
libraries	O
meant	O
for	O
use	O
on	O
embedded	O
devices	O
.	O
</s>
<s>
Additionally	O
,	O
the	O
patent	O
grant	O
in	O
the	O
Apache	O
License	O
would	O
have	O
protected	O
only	O
contributors	O
and	O
users	O
of	O
the	O
.NET	B-Application
Micro	I-Application
Framework	I-Application
—	O
not	O
users	O
and	O
developers	O
of	O
alternative	O
implementations	O
such	O
as	O
DotGNU	B-Application
or	O
Mono	B-Application
.	O
</s>
<s>
In	O
2014	O
,	O
Microsoft	O
released	O
Roslyn	B-Application
,	O
the	O
next	O
generation	O
official	O
Microsoft	O
C#	B-Application
compiler	O
,	O
under	O
the	O
Apache	O
License	O
.	O
</s>
<s>
Later	O
that	O
year	O
,	O
Microsoft	O
announced	O
a	O
"	O
reboot	O
"	O
of	O
the	O
official	O
.NET	B-Application
Framework	I-Application
.	O
</s>
<s>
The	O
framework	O
would	O
be	O
based	O
on	O
.NET	B-Application
Core	I-Application
,	O
including	O
the	O
official	O
runtime	O
and	O
standard	O
libraries	O
released	O
under	O
the	B-License
MIT	I-License
License	I-License
and	O
a	O
patent	O
grant	O
explicitly	O
protecting	O
recipients	O
from	O
Microsoft-owned	O
patents	O
regarding	O
.NET	B-Application
Core	I-Application
.	O
</s>
