tokens: It was proposed for Java 7 as part of Project Coin : https://wiki.openjdk.java.net/display/Coin/2009+Proposals+TOC ( Elvis and Other Null-Safe Operators ) , but has n't been accepted yet .
ner_tags: O O O O B-Language B-Version O O O O O O O O O O O O O O O O O O O O O O