rdf-use-cases.md

@@ -6,8 +6,13 @@ Described potential relations go in both directions and need to be named.
 
 ### Variables
 - source variable is the same variable as in the target study (wave)
+  - possible names: basedOn (followsOn) 
 - source variable is annotated by a controlled vocabulary(ies)
+  - possible names: 
 - source variable is derived by target variable(s)
+  - possible names: derivedFrom
+- source variable is aggregated by target variables(s)
+  - possible names: aggregatedFrom
 
 ### Question
 - source question is "in order" next to the target question (Order within questionnaire)