With no explanation, label each line with "O", "product-software", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
Apache
Struts
2
is
an
open-source
web
application
framework
for
developing
Java
EE
web
applications
.
Apache:product-software
Struts:product-software
2:product-software
is:O
an:O
open-source:O
web:O
application:O
framework:O
for:O
developing:O
Java:product-software
EE:product-software
web:O
applications:O
.:O