Currently, research efforts have derived useful discrete features from dependency structures (Sasano and Kurohashi, 2008;Cucchiarelli and Velardi, 2001;Ling and Weld, 2012) or structural constraints (Jie et al., 2017) to help the NER task.
how to make good use of the rich relational information as well as complex long-distance interactions among words as conveyed by the complete dependency structures for improved NER remains a research question to be answered.