<s>
XOTcl	B-Language
is	O
an	O
object-oriented	B-Language
extension	O
for	O
the	O
Tool	B-Operating_System
Command	I-Operating_System
Language	I-Operating_System
created	O
by	O
Gustaf	O
Neumann	O
and	O
Uwe	O
Zdun	O
.	O
</s>
<s>
It	O
is	O
a	O
derivative	O
of	O
MIT	O
OTcl	B-Language
.	O
</s>
<s>
XOTcl	B-Language
is	O
based	O
on	O
a	O
dynamic	O
object	B-Language
system	I-Language
with	O
metaclasses	B-Language
which	O
as	O
influenced	O
by	O
CLOS	B-Application
.	O
</s>
<s>
Class	O
and	O
method	B-Language
definitions	O
are	O
completely	O
dynamic	O
.	O
</s>
<s>
XOTcl	B-Language
provides	O
language	O
support	O
for	O
design	O
patterns	O
via	O
filters	O
and	O
decorator	O
mixins	B-Language
.	O
</s>
