( ( ( A ( useful measurement ) ) ( of ( ( the distance ) ( between ( two tags ) ) ) ) ) ( ( will ( be ( ( ( the ( Hamming distance ) ) , ) ( defined ( as ( ( the number ) ( of ( positions ( of disagreement ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (JJ useful) (NN measurement)) (PP (IN of) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (CD two) (NNS tags)))))) (VP (MD will) (VP (VB be) (NP (NP (DT the) (NNP Hamming) (NN distance)) (, ,) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS positions)) (PP (IN of) (NP (NN disagreement))))))))))) (. .)))
A useful measurement of the distance between two tags will be the Hamming distance, defined as the number of positions of disagreement.
(ROOT (S (NP (NNP Distance)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN magnitude) (CC or) (NN size)) (PP (IN of) (NP (NP (NN displacement)) (PP (IN between) (NP (CD two) (NNS positions))))))))) (. .)))