3. The method of claim 2 , wherein the node type is associated with a grammatical element of the grammatical structure of the one or more sentences.
4. The method of claim 3 , wherein the node-type of the at least one node is a secondary class node type and said step of selecting comprises: determining which node has a secondary class node type, that is at a lower position within the grammatical tree than any other node having a secondary class node type.