increment the use count . concode_field_sep String _stack_type concode_elem_sep String _name concode_elem_sep int _index concode_elem_sep int _use_count concode_field_sep int use_count concode_elem_sep String stack_type concode_elem_sep String name concode_elem_sep boolean is_non_term concode_elem_sep int index concode_elem_sep String toString