tokens: Is there any existing container that checks its members for " dirty " and only updates those values when writing to file ; or better yet , a protocol that can be implemented to do the same ; or any other simple , available way of doing this ?
ner_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O