<s>
Lexical	B-General_Concept
choice	I-General_Concept
is	O
the	O
subtask	O
of	O
Natural	B-General_Concept
language	I-General_Concept
generation	I-General_Concept
that	O
involves	O
choosing	O
the	O
content	O
words	O
(	O
nouns	O
,	O
verbs	O
,	O
adjectives	O
,	O
and	O
adverbs	O
)	O
in	O
a	O
generated	O
text	O
.	O
</s>
<s>
Function	O
words	O
(	O
determiners	O
,	O
for	O
example	O
)	O
are	O
usually	O
chosen	O
during	O
realisation	B-General_Concept
.	O
</s>
<s>
The	O
simplest	O
type	O
of	O
lexical	B-General_Concept
choice	I-General_Concept
involves	O
mapping	O
a	O
domain	O
concept	O
(	O
perhaps	O
represented	O
in	O
an	O
ontology	O
)	O
to	O
a	O
word	O
.	O
</s>
<s>
Lexical	B-General_Concept
choice	I-General_Concept
modules	O
must	O
be	O
informed	O
by	O
linguistic	O
knowledge	O
of	O
how	O
the	O
system	O
's	O
input	O
data	O
maps	O
onto	O
words	O
.	O
</s>
<s>
This	O
is	O
a	O
question	O
of	O
semantics	B-Application
,	O
but	O
it	O
is	O
also	O
influenced	O
by	O
syntactic	B-Application
factors	O
(	O
such	O
as	O
collocation	B-General_Concept
effects	O
)	O
and	O
pragmatic	O
factors	O
(	O
such	O
as	O
context	O
)	O
.	O
</s>
<s>
Ultimately	O
,	O
lexical	B-General_Concept
choice	I-General_Concept
must	O
deal	O
with	O
the	O
fundamental	O
issue	O
of	O
how	O
language	O
relates	O
to	O
the	O
non-linguistic	O
world	O
.	O
</s>
<s>
A	O
number	O
of	O
algorithms	O
and	O
models	O
have	O
been	O
developed	O
for	O
lexical	B-General_Concept
choice	I-General_Concept
in	O
the	O
research	O
community	O
,	O
for	O
example	O
Edmonds	O
developed	O
a	O
model	O
for	O
choosing	O
between	O
near-synonyms	O
(	O
words	O
with	O
similar	O
core	O
meanings	O
but	O
different	O
connotations	O
)	O
.	O
</s>
