Use JAVA API to find referenced sequence diagrams

public class test {
    
    static Boolean foundRefSeqDiagram = false;
    public static void main(String[] args) {
        IRPApplication app = RhapsodyAppServer.getActiveRhapsodyApplication();
        IRPModelElement el = app.getSelectedElement();
        // get selected sequence diagram
        if (el instanceof IRPSequenceDiagram)
        {
            IRPSequenceDiagram sd = (IRPSequenceDiagram)el;
            System.out.println("Searching sequence diagram: " + sd.getName());
            //get all graphic elements from sequence diagram
            @SuppressWarnings("unchecked")
            List<Object> graphObjList = sd.getGraphicalElements().toList();
            for(Object graphObj : graphObjList)
            {
                if(graphObj instanceof IRPGraphNode)
                {
                    IRPGraphNode graphNode = (IRPGraphNode)graphObj;
                    // try to find the associated model element
                    try
                    {
                        IRPModelElement graphModelElement = graphNode.getModelObject();
                        System.out.println("\tFound " + graphModelElement.getMetaClass());
                        
                        // look for nested ref seq diagram
                        if(graphModelElement instanceof IRPInteractionOccurrence)
                        {
                            IRPInteractionOccurrence io = (IRPInteractionOccurrence)graphModelElement;
                            IRPSequenceDiagram refSeqDiagram = io.getReferenceSequenceDiagram();
                            System.out.println("\t\tFound reference (nested) sequence diagram: " + refSeqDiagram.getFullPathName());
                            // highlight the item in the Rhapsody UI
                            app.highLightElement(refSeqDiagram);
                            foundRefSeqDiagram = true;
                        }
                    }
                    catch(Exception e)
                    {
                        // the graphic element is graphical only e.g. a note or anchor. skip it.
                        System.out.println("\tNo model element for " + graphNode.getGraphicalProperty("Type").getValue());
                    }    
                }
            }
            if(!foundRefSeqDiagram)
            {
                System.out.println("\tNo reference sequence diagrams found! Try a different diagram?");
            }
        }
        else
        {
            System.out.println("Please select a sequence diagram and try again.");
        }
    }
}