NIAD-3070: Quantity encoding behaviour is wrong.

[MartinWheelerMT]

What

ObservationQuantityValueMapper has been updated to produce the correct output as specified in the MIM.

If valueQuantity.value is missing then the element will not be mapped.

If the system value is invalid, it should be handled in the same way as below, but as if the system value was not set.

Valid system values are:

• "http://unitsofmeasure.org"
• An OID (i.e. "1.2.3.4.5")
• An OID presented as a URN (i.e. "urn:oid:1.2.3.4.5")
• A UUID (i.e. "35bce269-2660-45bd-855a-721807185995")

Otherwise the mapping mapping will now be as follows, mapping to interval if valueQuantity.comparator is present, or to a standard Quantity

Quantity (Physical Quantity: PQ)

Given a FHIR Quantity containing both a system and code where system is equal to “http://unitsofmeasure.org" then the value should be converted to XML as:

<value xsi:type="PQ" value="${quantity.value}" unit="${quantity.code}" />

Otherwise, given a FHIR Quantity containing a system, code and unit where the system is anything else then the value should be converted to XML as:

<value xsi:type="PQ" value="${quantity.value}" unit="1">
      <translation value="${quantity.value}" code="${quantity.code}" codeSystem="${quantity.system}" displayName="${quantity.unit}"/>
</value>

Otherwise, given a FHIR Quantity containing a system and code where the system is anything else then the value should be converted to XML as:

<value xsi:type="PQ" value="${quantity.value}" unit="1">
      <translation value="${quantity.value}" code="${quantity.code}" codeSystem="${quantity.system}" />
</value>

Otherwise, given a FHIR Quantity containing a unit then the value should be converted to XML as:

<value xsi:type="PQ" value="${quantity.value}" unit="1">
     <translation value="${quantity.value}">
          <originalText>${quantity.unit}</originalText>
     </translation>
</value>

Otherwise, given a FHIR Quantity containing just a value (no unit, no code, no system), then the value should be converted to XML as:

<value xsi:type="PQ" value="${quantity.value}" unit="1" />

Interval (Physical Quantity Interval (IVL_PQ)

Given a FHIR Quantity described as an interval, then the same rules as above apply, but with value element being named high or low according to the existing behaviour, wrapped in a value element.

Why

It was identified during testing that the mapping of Observation.valueQuantity was not producing the correct XML in certain circumstances.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section if this change will affect end users