Source:http://linkedlifedata.com/resource/umls/id/C1555714
HL7V3.0: <p>This context represents the information acquired and recorded for an observation, a clinical statement such as a portion of the patient's history or an inference or assertion, or an action that might be intended or has actually been performed. This class may represent both the actual data describing the observation, inference, or action, and optionally the details supporting the clinical reasoning process such as a reference to an electronic guideline, decision support system, or other knowledge reference.</p>