thanks to all for your quick reply.
while i have heard/used about few of the services above, i was looking for something that could give me LOD URI for few words at most and often a single word(eg china or moon) rather than full text extraction. if the word is ambiguous i am ok with a list of URIs as well. meanwhile i will look up the references provided to see if there is anything that fits my bill thanks ravinder thakur
