====== Formal Grammar ======

===== String Grammars =====
  * See [[CFGs and SCFGs]]

===== Tree Grammars =====

===== Graph Grammars =====
  * [[https://www.aclweb.org/anthology/W17-3410.pdf|Gilroy et al 2017 - (Re)introducing Regular Graph Languages]]
  * [[https://www.aclweb.org/anthology/J18-1005.pdf|Chiang et al 2018 - Weighted DAG Automata for Semantic Graphs]]