public Parser footing() {
        if (footingParser == null) {
           FutureParser future = scoped("footing");
           footingParser = future;
           future.setParser(
               sequence(
                   optional(
                       token("WITH")
                   ),
                   token("FOOTING"),
                   optional(
                       token("AT")
                   ),
                   choice(
                       dataName(),
                       integer()
                   )
               )
           );
        }

        return footingParser;
    }