<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A role used to represent that a clinical observation, sign or symptom will only be observed in some cases of the disease. Both the domain and range for this role are 'Disease, Disorder or Finding'.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>