public String next(Object prop) {
      StringBuilder sb = new StringBuilder();
      String name = sb.append(PREFIX).append("_ITEM").append("_").append(count++).toString();
      bindings.put(name, prop);
      return name;
    }
Just a test case. Not a real Velocity implementation.
src/test/java/org/apache/ibatis/submitted/language/VelocitySqlSource.java