code: public NamespaceMappings getNamespaceMappings()
      {
          NamespaceMappings mappings = null;
          if (m_handler != null)
          {
              mappings = m_handler.getNamespaceMappings();
          }
          return mappings;
      }
docs: Get the current namespace mappings.
  Simply returns the mappings of the wrapped handler.
  @see ExtendedContentHandler#getNamespaceMappings()