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VMD files are a big part of what makes IguanaX an easy environment to handle HL7 and X12 in.
HL7 is a delimiter based structure which is not very readable
See how this raw HL7 message is not very readable:
MSH|^~\&|MESA_ADT|XYZ_ADMITTING|iFW|ZYX_HOSPITAL|||ADT^A01|103102|P|2.4||||||||
EVN||200007010800||||200007010800
PID|||583295^^^ADT1||DOE^JANE||19610615|M-||2106-3|123 MAIN STREET^^GREENSBORO^NC^27401-1020|GL|(919)379-1212|(919)271-3434~(919)277-3114||S||PATID12345001^2^M10|123456789|9-87654^NC
NK1|1|BATES^RONALD^L|SPO|||||20011105
VMD files give a dictionary of each part of an HL7 message
The entries in the dictionary give the names and descriptions of the fields in the message.
Iguana is able to use this dictionary to make it more intuitive as to what the fields mean.
This video explains the benefit:
whyvmd.mp4