protected function _compareRefPosition( MShop_Common_Item_Interface $a, MShop_Common_Item_Interface $b )
	{
		if( $a->_position === $b->_position ) {
			return 0;
		}

		return ( $a->_position < $b->_position ) ? -1 : 1;
	}
protected function _compareRefPosition( MShop_Common_Item_Interface $a, MShop_Common_Item_Interface $b )
	{
		if( $a->_position === $b->_position ) {
			return 0;
		}

		return ( $a->_position < $b->_position ) ? -1 : 1;
	}
protected function _compareRefPosition ( MShop_Common_Item_Interface $ a , MShop_Common_Item_Interface $ b ) { if ( $ a -> _position === $ b -> _position ) { return 0 ; } return ( $ a -> _position < $ b -> _position ) ? - 1 : 1 ; }
Compares the positions of two referenced items for sorting.

@param MShop_Common_Item_Interface $a First referenced item
@param MShop_Common_Item_Interface $b Second referenced item
@return integer -1 if position of $a < $b, 1 if position of $a > $b and 0 if both positions are equal
Compares the positions of two referenced items for sorting .