Compare child nodes to control value while parsing XML

[rainsonb]

I have an XML file organized like this, items under each node are always in alphabetical order:\[code\]<xml> <node id="2"> <jack>Jack wrote this.</jack> <john>John wrote this.</john> </node> <node id="4"> <jack>Jack wrote this.</jack> <jill>Jill wrote this.</jill> </node> <node id="9"> <jack>Jack wrote this.</jack> <james>James wrote this.</james> <jill>Jill wrote this.</jill> <john>John wrote this.</john> </node></xml>\[/code\]As you can see, not all the names are under each node. For example, in \[code\]<node id="4">\[/code\], John and James did not write anything. For the above example, I'd like my program to return something like this:\[code\]James did not write 2, 4Jill did not write 2John did not write 4\[/code\]I need to keep track of who didn't write what. I am currently parsing the document like this:\[code\]private static String getTagValue(final Element element){ String theId=""; if (element.getTagName().startsWith("node")){ theId = element.getAttribute("id"); return theId; } return theId;}private static void readXML(String fileName){ for (int index = 0; index < nodeList.getLength(); index++){ Node node = nodeList.item(index); Element element = (Element) node; if (node.getNodeType() == Node.ELEMENT_NODE){ // This prints the node id if(getTagValue(element)!=""){ System.out.println(getTagValue(element)+" = I am the node id number!"); } // This prints the name else{ System.out.println(element.getTagName()+" = I am the name!"); } } }}\[/code\]What I'd like to do is somehow compare the elements under each node to a "control" list that contains all of the names, and if it doesn't contain a name, it returns the name and its parent node.In reality, the XML I'm dealing with is much larger, so performance matters, but the concept is the same. Any help would be fantastic.