anchor.diff:  | | |mmlHd:code|string|#IMPLIED|
   | | |mmlHd:type|string|#IMPLIED|
   | | |mmlHd:membraneArea|string|#IMPLIED|
  -| | |mmlHd:unit|string|#IMPLIED|
  +| | |mmlHd:unit|string|#REQUIRED|
   |1.1.5.1.1.8|mmlHd:dialysate| | |*|
   |1.1.5.1.1.8.1|mmlHd:dialysateName| |string| |
   | | |mmlHd:code|string|#IMPLIED|
  
positive.code: | | |mmlHd:timeDirection|string|#REQUIRED|
  |1.1.5.1.1.11.3 |mmlHd:timeHdEnd| |timePeriod|?|
  | | |mmlHd:timeDirection|string|#REQUIRED|
  |1.1.5.1.1.12| |mmlHd:needle|string|*|
  | | |mmlHd:code|string|#IMPLIED|
  | | |mmlHd:type|string|#IMPLIED|
  | | |mmlHd:position|string|#IMPLIED|
  
negative.code: |1.1|mmlHd:HemoDialysis| | |*|
  |1.1.1|mmlFc:Facility| | | |
  |1.1.2|mmlPi:PatientModule| | | |
  |1.1.3|mmlHd:note| |string|?|
  |1.1.4|mmlHd:HDHistorySection| | |?|
  |1.1.4.1|mmlHd:HdIntroduction| | |*|
  |1.1.4.1.1|mmlHd:diagnosis| | |?|
  