question: default visit implementation . returns null . concode_field_sep PlaceHolder placeHolder concode_field_sep V visit concode_elem_sep V visit concode_elem_sep V visit concode_elem_sep V visit concode_elem_sep V visit concode_elem_sep V visit concode_elem_sep V visit concode_elem_sep V visit concode_elem_sep V visit concode_elem_sep V visit
target: V function ( Element arg0 ) { return null ; }