<s>
Shallow	B-General_Concept
parsing	I-General_Concept
(	O
also	O
chunking	B-General_Concept
or	O
light	O
parsing	B-Language
)	O
is	O
an	O
analysis	O
of	O
a	O
sentence	O
which	O
first	O
identifies	O
constituent	O
parts	O
of	O
sentences	O
(	O
nouns	O
,	O
verbs	O
,	O
adjectives	O
,	O
etc	O
.	O
)	O
</s>
<s>
While	O
the	O
most	O
elementary	O
chunking	B-General_Concept
algorithms	O
simply	O
link	O
constituent	O
parts	O
on	O
the	O
basis	O
of	O
elementary	O
search	O
patterns	O
(	O
e.g.	O
,	O
as	O
specified	O
by	O
regular	B-Language
expressions	I-Language
)	O
,	O
approaches	O
that	O
use	O
machine	O
learning	O
techniques	O
(	O
classifiers	O
,	O
topic	O
modeling	O
,	O
etc	O
.	O
)	O
</s>
<s>
It	O
is	O
a	O
technique	O
widely	O
used	O
in	O
natural	B-Language
language	I-Language
processing	I-Language
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
the	O
concept	O
of	O
lexical	B-Application
analysis	I-Application
for	O
computer	O
languages	O
.	O
</s>
<s>
Under	O
the	O
name	O
"	O
shallow	O
structure	O
hypothesis	O
"	O
,	O
it	O
is	O
also	O
used	O
as	O
an	O
explanation	O
for	O
why	O
second	O
language	O
learners	O
often	O
fail	O
to	O
parse	B-Language
complex	O
sentences	O
correctly	O
.	O
</s>
