docs: function _fnMap( oRet, oSrc, sName, sMappedName )
  		{
  			if ( sMappedName === undefined )
  			{
  				sMappedName = sName;
  			}
  			if ( oSrc[sName] !== undefined )
  			{
  				oRet[sMappedName] = oSrc[sName];
  			}
  		}