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   @GET
    @Produces(MediaTypeUtils.ATOM_SERVICE_DOCUMENT)
    public AppService getServiceDocument() {
        AppService serviceDocument = new AppService();
        List<AppWorkspace> workspaces = serviceDocument.getWorkspace();
        AppWorkspace workspace1 =  new AppWorkspace();
        workspace1.setTitle(new AtomText("Workspace1"));
        List<AppCollection> collections = workspace1.getCollection();
        AppCollection collection = new AppCollection();
        collection.setTitle(new AtomText("Collection1"));
        
        collections.add(collection);
        workspaces.add(workspace1);
        ...
        return serviceDocument;
    }