public Parser valueOfFileId() {
        if (valueOfFileIdParser == null) {
           FutureParser future = scoped("valueOfFileId");
           valueOfFileIdParser = future;
           future.setParser(
               sequence(
                   token("VALUE"),
                   token("OF"),
                   token("FILE-ID"),
                   optional(
                       token("IS")
                   ),
                   choice(
                       dataName(),
                       literal()
                   )
               )
           );
        }

        return valueOfFileIdParser;
    }