@Override
    public IExportWriter startPlanVersion(PlanVersionBean pvb) {
        writeStartObject();
        try {
            pvb = (PlanVersionBean) pvb.clone();
            pvb.setPlan(null);
            jg.writeObjectField(PlanVersionBean.class.getSimpleName(), pvb);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return this;
    }
@see io.apiman.manager.api.exportimport.write.IExportWriter#startPlanVersion(io.apiman.manager.api.beans.plans.PlanVersionBean)
manager/api/export-import/src/main/java/io/apiman/manager/api/exportimport/json/JsonExportWriter.java