Hi,all, here is the gramma: columnName (',' columnName)* -> ^(SM_TOK columnName) I want the output ast of "A,B" to have multiple SM_TOK , like : (SM_TOK A) (SM_TOK B) But,currently,I only have: (SM_TOK A) It seems that 'B' will be ignored. Can anyone help me to fix this gramma?