code: public function GetItem( $id, $select = null, $expand = null, $use_cache = true ) {
  		$params = array();
  		if ( isset( $select ) && ! empty( $select ) ) {
  			$params['$select'] = $select;
  		}
  		if ( isset( $expand ) && ! empty( $expand ) ) {
  			$params['$expand'] = $expand;
  		}
  
  		if ( ! empty( $use_cache ) && ! $use_cache ) {
  			$params['cache'] = 'false';
  		}
  
  		return parent::GET( "($id)", $params, get_called_class() . '|' . __FUNCTION__ );
  	}
docs: @param int $id
  @param string|null $select
  @param string|null $expand
  @param bool $use_cache
  
  @return mixed