<s>
Scalatra	B-Language
is	O
a	O
free	O
and	O
open	O
source	O
web	B-Application
application	I-Application
framework	I-Application
written	O
in	O
Scala	B-Application
.	O
</s>
<s>
It	O
is	O
a	O
port	O
of	O
the	O
Sinatra	B-Application
framework	O
written	O
in	O
Ruby	B-Language
.	O
</s>
<s>
Scalatra	B-Language
is	O
an	O
alternative	O
to	O
the	O
Lift	B-Language
,	O
Play	O
!,	O
and	O
Unfiltered	O
frameworks	O
.	O
</s>
<s>
Scalatra	B-Language
is	O
an	O
example	O
of	O
a	O
microframework	B-Application
,	O
a	O
web	O
software	O
development	O
framework	O
which	O
attempts	O
to	O
be	O
as	O
minimal	O
as	O
possible	O
.	O
</s>
<s>
A	O
full	O
Scalatra	B-Language
application	O
can	O
be	O
written	O
in	O
very	O
few	O
lines	O
of	O
code	O
:	O
</s>
<s>
From	O
this	O
tiny	O
domain-specific	B-Language
language	I-Language
,	O
Scalatra	B-Language
can	O
be	O
expanded	O
into	O
a	O
minimal	O
but	O
full-featured	O
model-view-controller	O
web	B-Application
framework	I-Application
.	O
</s>
<s>
For	O
example	O
,	O
additional	O
libraries	O
can	O
be	O
attached	O
in	O
order	O
to	O
provide	O
templating	B-Application
,	O
object-relational	B-General_Concept
mapping	I-General_Concept
,	O
and	O
unit	O
testing	O
or	O
behaviour	O
driven	O
development	O
support	O
.	O
</s>
<s>
LinkedIn	B-Application
used	O
Scalatra	B-Language
to	O
power	O
its	O
now-defunct	O
Signal	O
API	B-Application
.	O
</s>
<s>
Parts	O
of	O
The	O
Guardian	O
's	O
API	B-Application
services	O
are	O
built	O
in	O
Scalatra	B-Language
.	O
</s>
<s>
has	O
built	O
its	O
API	B-Application
systems	O
using	O
Scalatra	B-Language
.	O
</s>
