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- The COMPOSITION class which is the container for all things committed to the EHR and corresponds to the idea of a document
- The ENTRY classes including:
- ACTION for recording what has been carried out
- EVALUATION for recording summary information or opinions
- INSTRUCTION for things that are to be done and when
- OBSERVATION for things that are expressed or measured. This will include expression of its event classes]:
- POINT_EVENT for a point in time, and
- INTERVAL_EVENT for data covering a period of time
- The ELEMENT class or leaf node which has data values.