public function getAliasUsage($withEncapsulation = true)
    {
        $aliases = '';

        foreach ($this->aliases as $prefix => $alias) {
            if ($withEncapsulation) {
                $aliases = ($aliases == '') ? ' (' : $aliases;
                $aliases .= ' '.$prefix.$alias;
            } else {
                $aliases = ($aliases == '') ? $prefix.$alias : $aliases.', '.$prefix.$alias;
            }
        }

        if ($withEncapsulation) {
            $aliases .= ($aliases == '') ? '' : ' )';
        }

        return $aliases;
    }