protected function checkAttributeNode(DOMAttr $attribute, Tag $tag)
	{
		// Parse the attribute value for XPath expressions and assess their safety
		foreach (AVTHelper::parse($attribute->value) as $token)
		{
			if ($token[0] === 'expression')
			{
				$this->checkExpression($attribute, $token[1], $tag);
			}
		}
	}