JFIFxxC      C  " }!1AQa"q2#BR$3br %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz w!1AQaq"2B #3RbrensureValidUri($value); $this->value = $value; } public function asString(): string { return $this->value; } private function ensureValidUri($value): void { if (\strpos($value, ':') === false) { throw new NamespaceUriException( \sprintf("Namespace URI '%s' must contain at least one colon", $value) ); } } }