<s>
Boomerang	B-General_Concept
is	O
a	O
programming	O
language	O
for	O
writing	O
lenses	O
—	O
well-behaved	O
bidirectional	B-Algorithm
transformations	I-Algorithm
—	O
that	O
operate	O
on	O
ad-hoc	O
,	O
textual	O
data	O
formats	O
.	O
</s>
<s>
Boomerang	B-General_Concept
grew	O
out	O
of	O
the	O
Harmony	O
generic	O
data	O
synchronizer	B-Application
,	O
which	O
grew	O
out	O
of	O
the	O
Unison	O
file	B-Application
synchronization	I-Application
project	O
.	O
</s>
