1 code,message,sender,parameter_1,parameter_2,parameter_3,parameter_4

     2 100,VERSION_SUPPORTED,executor,version,,,

     3 101,WAITING_FOR_VERSION,executor,,,,

     4 102,VERSION_ACCEPTED,streamlet,version,,,

     5 103,RELATION_START,executor,name,,,

     6 104,INPUT_ATTRIBUTE_METADATA,executor,name,type,,

     7 105,OUTPUT_ATTRIBUTE_ALIAS,executor,name,,,

     8 106,OPTION,executor,name,type,value,

     9 107,COMPLETION_REQUEST,executor,what,value,,

    10 108,COMPLETION,streamlet,value,,,

    11 109,COMPLETION_END,streamlet,,,,

    12 110,WAITING_FOR_OUTPUT_ATTRIBUTES_METADATA,executor,,,,

    13 111,OUTPUT_ATTRIBUTE_METADATA,streamlet,name,type,,

    14 112,WAITING_FOR_INPUT_ATTRIBUTES,streamlet,,,,

    15 113,INPUT_ATTRIBUTE,executor,index,value,isNull,

    16 114,WAITING_FOR_OUTPUT_ATTRIBUTES,executor,,,,

    17 115,OUTPUT_ATTRIBUTE,streamlet,value,isNull,,

    18 116,EXECUTOR_ERROR,executor,code,message,,

    19 117,STREAMLET_ERROR,streamlet,code,message,,

    20 118,STREAMLET_WARNING,streamlet,code,message,,

    21 120,RELATION_END,executor,,,,

    22 0,any_streamlet,streamlet,,,,

    23 0,any_executor,executor,,,,