What is the Technical Reason for Creating Message Type

Hi,
      Is there any particular reason to use Message Type. Already we are defining Data Type. Please give me some detailed explanations.
Thanks in Advance.
Thanks & Regards,
Giridhar.C

Hi Giri,
SAP telling below reason why we are creating message type
"A message type comprises a data type that describes the structure of a message. For technical reasons, a data type alone is not sufficient to describe the instance of a message: Data types are defined in XML Schema as abstract types that are not yet tied to an element. You can only describe an instance of a message when you have specified a data type as an element type. Therefore, a message type defines the root element of a message"
Regards,
Raj

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