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Message Type
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A message type is the lowest "standardized" level of refinement in the HL7 design process, which typically starts at the RIM, constraining to a D-MIM, then to an R-MIM, then to an HMD and finally to a Message Type. Message types define the classes, associations and attributes which are permitted in an instance or portion of an instance. Message types also define constraints on cardinality, use of null flavors, vocabulary domains, etc.
