This diagram shows the structure of a ReferenceState_t node and its
children.
At the top is the ReferenceState_t node.
Below ReferenceState_t are the following nodes.
- DataClass_t (data class)
- Descriptor_t (text)
- DimensionalUnits_t (units)
- Descriptor_t (reference state description)
- DataArray_t (reference state value)
- UserDefinedData_t