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The following constitute substantive V2 changes:

    • Addition or deletion of a trigger event - This implies the definition of an abstract message corresponding to the trigger event.
    • Addition or deletion of an abstract message or change to an existing one - This includes addition or deletion of segments or segment groups, changes in segment or segment group repetition and changes to segment or segment group optionality.
    • Addition of a segment - This implies the use of the segment in an abstract message.
    • Addition of a data element within a segment.
    • Changes to an existing data element - This includes changes to element repetition or optionality.  It also includes changing the code table assigned to a coded value. When an element is used differently in different segments, e.g. different lengths, this can be addressed as a non-substantive technical correction if the segments are newly conceived.  However, if this is a situation of long standing, fixing it should be considered as substantive.  In this case, the proper tack is to choose a standard length, deprecate the element uses that do not fit, and add the needed elements to the end of affected segments.
    • Addition of a data type - This implies its assignment to a data element.
    • Change to an existing data type - This includes addition or deletion of components, and changes to component order, optionality, or repetition.  It includes changes to the data type assigned to a component, and/or changes in the maximum length of a component.
    • Changes to an HL7 defined table - This implies that the code table is assigned to at least one data element.  Substantive changes include the addition or subtraction of code values.
    • Change to a definition that changes how a receiving system has to manage the received message.
    • Changes to chapter text that change the rules for when a trigger event is used.
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