Namedoco
.. Observation
... status
... code
.... coding
... subject
.... reference
.... identifier
... Slices for effective[x]
.... effective[x]:effectiveDateTime
... Slices for component
.... component:length_of_gestation_in_weeks
..... code
...... coding
....... system
....... code
....... display
..... value[x]
...... unit
...... system
...... code
.... component:length_of_gestation_in_days
..... code
...... coding
....... system
....... code
....... display
..... value[x]
...... unit
...... system
...... code

doco Documentation for this format