I'm trying to determine if a particular XML file has a node. I'm parsing through each of the nodes and updating one of the child nodes but for rerun ability I don't want to update it if the values haven't changed. I'm running into an instance where one of my child nodes doesn't exist. In that case I want to skip that update. It is failing because $i for item($i) ($i could be anything from 0 to 9) doesn't exist. In this case it is item(0). I'm trying to figure out a way to find out if put an undef reference or code this a different way so it doesn't fail just skips the if statement.

my $length = $objXmlConfig->getElementsByTagName"comments_en-US")->get
+Length;
                    DEBUG "length " .$length;
                    if ($objXmlConfig->getElementsByTagName("comments_
+en-US")->getLength > 0){
                        $comments = $objXmlConfig->getElementsByTagNam
+e("comments_en-US")->item($i)->getFirstChild->getNodeValue;
                    }
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