code: public String getTemplateNameByRef( String refGroupName, String key )
      {
          String templateName = null;
          Map/*< String, String >*/ templateRefGroup = ( Map ) _templateRefGroups.get( refGroupName );
          if ( templateRefGroup != null )
          {
              templateName = ( String ) templateRefGroup.get( key );
          }
  
          return templateName;
      }
docs: Retrieve a template name from a reference group in url-template-config.
  
  @param refGroupName the name of the template reference group.
  @param key the key to the particular template reference in the group.
  @return a template name from the reference group.