<s>
Escher	B-Language
(	O
named	O
for	O
M	O
.	O
C	O
.	O
Escher	B-Language
,	O
"	O
a	O
master	O
of	O
endless	O
loops	O
"	O
)	O
is	O
a	O
declarative	B-Language
programming	I-Language
language	I-Language
that	O
supports	O
both	O
functional	B-Language
programming	I-Language
and	O
logic	B-Language
programming	I-Language
models	O
,	O
developed	O
by	O
J.W.	O
</s>
<s>
The	O
basic	O
view	O
of	O
programming	O
exhibited	O
by	O
Escher	B-Language
and	O
related	O
languages	O
is	O
that	O
a	O
program	O
is	O
a	O
representation	O
of	O
a	O
theory	O
in	O
some	O
logic	B-Language
framework	O
,	O
and	O
the	O
program	O
's	O
execution	O
(	O
computation	O
)	O
is	O
a	O
deduction	O
from	O
the	O
theory	O
.	O
</s>
<s>
The	O
logic	B-Language
framework	O
for	O
Escher	B-Language
is	O
Alonzo	O
Church	O
's	O
simple	O
theory	O
of	O
types	O
.	O
</s>
<s>
Escher	B-Language
,	O
notably	O
,	O
supports	O
I/O	O
through	O
a	O
monadic	O
type	O
representing	O
the	O
'	O
outside	O
world	O
 '	O
,	O
in	O
the	O
style	O
of	O
Haskell	B-Language
.	O
</s>
<s>
One	O
of	O
the	O
goals	O
of	O
Escher	B-Language
's	O
designers	O
was	O
to	O
support	O
meta-programming	B-Application
,	O
and	O
so	O
the	O
language	O
has	O
comprehensive	O
support	O
for	O
generating	O
and	O
transforming	O
programs	O
.	O
</s>
