<s>
Calais	B-General_Concept
is	O
a	O
service	O
by	O
Thomson	O
Reuters	O
that	O
automatically	O
extracts	O
semantic	O
information	O
from	O
web	O
pages	O
in	O
a	O
format	O
that	O
can	O
be	O
used	O
on	O
the	O
semantic	O
web	O
.	O
</s>
<s>
Calais	B-General_Concept
was	O
launched	O
in	O
January	O
2008	O
,	O
and	O
is	O
free	O
to	O
use	O
.	O
</s>
<s>
The	O
Calais	B-General_Concept
Web	O
service	O
reads	O
unstructured	B-Application
text	O
and	O
returns	O
Resource	O
Description	O
Framework	O
formatted	O
results	O
identifying	O
entities	O
,	O
facts	O
and	O
events	O
within	O
the	O
text	O
.	O
</s>
<s>
The	O
service	O
appears	O
to	O
be	O
based	O
on	O
technology	O
acquired	O
when	O
Reuters	O
purchased	O
ClearForest	B-General_Concept
in	O
2007	O
.	O
</s>
<s>
The	O
technology	O
has	O
also	O
been	O
used	O
to	O
automatically	O
tag	B-General_Concept
blog	O
articles	O
,	O
and	O
organize	O
museum	O
collections	O
.	O
</s>
<s>
Calais	B-General_Concept
uses	O
natural	B-Language
language	I-Language
processing	I-Language
technologies	O
delivered	O
via	O
a	O
web	O
service	O
interface	O
.	O
</s>
