function typeIndex() {
		if (!$this->parent) {
			return -1;
		} else {
			$index = -1;
			//foreach($this->parent->children as &$c) {
			//	if (strcasecmp($this->tag, $c->tag) === 0) {
			//		++$index;
			//	}
			//	if ($c === $this) {
			//		return $index;
			//	}
			//}

			foreach(array_keys($this->parent->children) as $k) {
				if (strcasecmp($this->tag, $this->parent->children[$k]->tag) === 0) {
					++$index;
				}
				if ($this->parent->children[$k] === $this) {
					return $index;
				}
			}
			return -1;
		}
	}