public override void Render(ExtensionHtmlRenderer renderer, Diagram diagram, IFormatState formatState)
 {
     if (diagram.Path != null)
     {
         var path = new Path(diagram.Path);
         RenderDiagram(path, renderer);
     }
     if (diagram.PackagePath != null)
     {
         var path  = new Path(diagram.PackagePath);
         var paths = _provider.GetDiagramPaths(path);
         foreach (var diagramPath in paths)
         {
             RenderDiagram(diagramPath, renderer);
         }
     }
 }