DN.VertexSizeStyle : DIA.Style
DN.EdgeThicknessStyle : DIA.Style
DN.HideStyle : DIA.Style
+DN.VertexSymbolStyle : DIA.Style
+
+// Function for dynamic selection of symbols for a vertex
+// The input of the function is a DN.Vertex
+// The output of the function should be SVG
+DN.HasSymbolFunction <R L0.HasProperty
+ <-- DIA.ProfileEntry
+ --> L0.ExternalValue
+ ==> "Resource -> <ReadGraph> String"