+## The mapping dictionary from datum type to its maximum number.\r
+MAX_VAL_TYPE = {"BOOLEAN":0x01, TAB_UINT8:0xFF, TAB_UINT16:0xFFFF, TAB_UINT32:0xFFFFFFFF, TAB_UINT64:0xFFFFFFFFFFFFFFFF}\r
+## The mapping dictionary from datum type to size string.\r
+MAX_SIZE_TYPE = {"BOOLEAN":"1", TAB_UINT8:"1", TAB_UINT16:"2", TAB_UINT32:"4", TAB_UINT64:"8"}\r
+\r