+diagramsOf model = diagramsUnder $ configurationOf model
+
+"""
+Returns all diagrams under the specified diagram folder.
+The parameter can also be the configuration root `configurationOf`
+in which case this function returns the same as `diagramsOf model`.
+"""
+diagramsUnder :: DiagramFolder -> <ReadGraph> [Resource]
+diagramsUnder folder = recurse DIA.Diagram folder