docs: public Map<String,Object> getProperties()
      {
          Map<String,Object> properties = super.getProperties();
          if (m_mapMessageHeader != null)
              properties.putAll(m_mapMessageHeader);
          if (m_mapMessageInfo != null)
              properties.putAll(m_mapMessageInfo);
          if (m_mapMessageTransport != null)
              properties.putAll(m_mapMessageTransport);
          return properties;
      }