import org.w3c.dom.*;
import org.apache.xerces.parsers.DOMParser;

class DisplayElements
{
    public static void displayDocument(String uri)
	{
	    try {
		DOMParser parser = new DOMParser();
		parser.parse(uri);
		Document doc = parser.getDocument();
		display_names(doc);
	    } catch (Exception e) {
		e.printStackTrace(System.err);
	    }
	}

    public static void display_names(Node node)
	{
	    if(node == null) {
		return;
	    }
	    int type = node.getNodeType();
	    switch (type) {
	    case Node.DOCUMENT_NODE: {
		display_names(((Document)node).getDocumentElement());
		break;
	    }
	    case Node.ELEMENT_NODE: {
		System.out.println("Element : " + node.getNodeName());
		
		NodeList childNodes = node.getChildNodes();	
		if(childNodes != null) {
		    int length = childNodes.getLength();
		    for (int loopIndex = 0; loopIndex < length ; loopIndex++)
		    {
			display_names(childNodes.item(loopIndex));
		    }
		}
		break;
	    }   
	    }
	}
}

public class DOMNameElements
{

    public static void main(String[] args)
	{
	    DisplayElements.displayDocument(args[0]);
	}
}