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Understanding messages MDSum

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I am trying to understand how the MD5Sum of the messages is being calculated following this [link](http://wiki.ros.org/ROS/Technical%20Overview#Message_serialization_and_msg_MD5_sums) So far, I undestand that a plain message like std_msgs/Header translates to: uint32 seq time stamp string frame_id And if I paste that block of text into [this online MD5Sum calculator](http://www.password-generator-tool.com/md5-hash-generator) it correctly gives me the Header hash: 2176decaecbce78abc3b96ef049fabed Now, for complex messages, the documentation states that: "*In order to catch changes that occur in embedded message types, the MD5 text is concatenated with the MD5 text of each of the embedded types, in the order that they appear.*" So, how that would translate to a message like geometry_msgs/Vector3Stamped ? I tried combinations like this: Header header Vector3 vector uint32 seq time stamp string frame_id float64 x float64 y float64 z or like this: Header header Vector3 vector 2176decaecbce78abc3b96ef049fabed 4a842b65f413084dc2b10fb484ea7f17 Also with capital letters but none gives me the correct Vector3Stamped MD5Sum of 7b324c7325e683bf02a9b14b01090ec7

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