function setKey($key) {
		$this->cnxn->confirmTransaction('setKey');
		$currKey = $this->key;
		if (!is_null($currKey) && is_null($key)) {
			$this->cnxn->unregisterStructWithKey($this, $currKey);
		} else if (is_null($currKey) && !is_null($key)) {
			$this->cnxn->registerStructWithKey($this, $key);
		} else if ($currKey != $key) {
			$this->cnxn->unregisterStructWithKey($this, $currKey);
			$this->cnxn->registerStructWithKey($this, $key);
		}
		$this->key = $key;
	}