tokens: The GSON library , which you can learn more about here , https://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/Gson.html , is the most user and beginner friendly JSON library I know of .
ner_tags: O B-Library O O O O O O O O O O O O O O O O O O O B-File_Type O O O O O