Leitura seletiva de partes de um XML

Pessoal,
Estou conseguindo ler um XML mas vem coisas a mais que nao preciso. O problema eh que o meu arquivo fonte XML tem tags repetidas em uma hirarquia assim (vejam a tag PLAN que se repete):

<explain>
    <Query-Text>
    </Query-Text>
    <Plan>
        <Node-Type></Node-Type>
        <Startup-Cost></Startup-Cost>
        <Total-Cost></Total-Cost>
        <Plan-Rows></Plan-Rows>
        <Plan-Width></Plan-Width>
        <Actual-Total-Time></Actual-Total-Time>
        <Sort-Key>
            <Item></Item>
        </Sort-Key>
        <Actual-Rows></Actual-Rows>
        <Actual-Loops></Actual-Loops>
        <Plans>
                <Plan>
                        <Node-Type></Node-Type>
                        <Startup-Cost></Startup-Cost>
                        <Total-Cost></Total-Cost>
                        <Plan-Rows></Plan-Rows>
                        <Plan-Width></Plan-Width>
                        <Sort-Key>
                            <Item></Item>
                        </Sort-Key>
                        <Actual-Rows></Actual-Rows>
                        <Actual-Loops></Actual-Loops>
                </Plan>
          </Plans>
    </Plan>
</explain>

Eu preciso somente ler as informacoes de PLAN: " Total-Cost" e “Actual-Total-Time” da primeira tag PLAN que aparece. O problema eh que existe PLAN em uma hirarquia interna e esta sendo lida tambem, o que nao preciso.
Como eu poderia fazer para ler somente a primeira tag PLAN, e nao as de dentro que nao me interessam?

Segue o codigo que estou utilizando.

======================= classe ReadXMLTest.java ===============================

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.DocumentBuilder;

import org.w3c.dom.Document;

import org.w3c.dom.NodeList;

import org.w3c.dom.Node;

import org.w3c.dom.Element;

import java.io.File;

public class ReadXMLTest {

public static void main(String argv[]) {

try {

File fXmlFile = new File("/home/user1/Downloads/LOGT1.xml");

DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();

Document doc = dBuilder.parse(fXmlFile);

doc.getDocumentElement().normalize();
System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("Plan");
 System.out.println("----------------------------");

for (int temp = 0; temp < nList.getLength(); temp++) {
    Node nNode = nList.item(temp);
            
    System.out.println("\nCurrent Element :" + nNode.getNodeName());
                
    if (nNode.getNodeType() == Node.ELEMENT_NODE) {

        Element eElement = (Element) nNode;
        System.out.println("Total Cost query: " + eElement.getElementsByTagName("Total-Cost").item(0).getTextContent());
        System.out.println("Actual Total Time query:" + eElement.getElementsByTagName("Actual-Total-Time").item(0).getTextContent());
    }
}
} catch (Exception e) {
e.printStackTrace();
}

}
}

-------------- ARQUIVO LOGT1.XML ---------------------------------------

1. <?xml version="1.0"?>
2. <explain xmlns="http://www.postgresql.org/2009/explain">
3.       <Query-Text>
4.     BEGIN;
5.     EXPLAIN (ANALYZE on, VERBOSE off, COSTS on, BUFFERS off)SELECT l_returnflag,l_linestatus, sum(l_quantity) as sum_qty,
6.     sum(l_extendedprice) as sum_base_price,
7.     sum(l_extendedprice * (1 - l_discount)) as sum_disc_price,
8.     sum(l_extendedprice * (1 - l_discount) * (1 + l_tax))
9.     as sum_charge,
10.     avg(l_quantity) as avg_qty, avg(l_extendedprice) as avg_price,
11.     avg(l_discount) as avg_disc, count(*) as count_order
12.     FROM H_lineitem
13.     WHERE H_lineitem.l_shipdate &lt;= TO_DATE ('1998/12/01','YYYY/MM/DD') - interval '10' day
14.     GROUP BY H_lineitem.l_returnflag, H_lineitem.l_linestatus
15.     ORDER BY H_lineitem.l_returnflag, H_lineitem.l_linestatus
16.     ;
17.     ROLLBACK;</Query-Text>
18.       <Plan>
19.         <Node-Type>Sort</Node-Type>
20.         <Startup-Cost>399301.55</Startup-Cost>
21.         <Total-Cost>399301.57</Total-Cost>
22.         <Plan-Rows>6</Plan-Rows>
23.         <Plan-Width>36</Plan-Width>
24.         <Actual-Startup-Time>17693.654</Actual-Startup-Time>
25.         <Actual-Total-Time>17693.654</Actual-Total-Time>
26.         <Actual-Rows>4</Actual-Rows>
27.         <Actual-Loops>1</Actual-Loops>
28.         <Sort-Key>
29.           <Item>l_returnflag</Item>
30.           <Item>l_linestatus</Item>
31.         </Sort-Key>
32.         <Plans>
33.           <Plan>
34.             <Node-Type>Aggregate</Node-Type>
35.             <Strategy>Hashed</Strategy>PP
36.             <Parent-Relationship>Outer</Parent-Relationship>
37.             <Startup-Cost>399301.21</Startup-Cost>
38.             <Total-Cost>399301.48</Total-Cost>
39.             <Plan-Rows>6</Plan-Rows>
40.             <Plan-Width>36</Plan-Width>
41.             <Actual-Startup-Time>17693.582</Actual-Startup-Time>
42.             <Actual-Total-Time>17693.586</Actual-Total-Time>
43.             <Actual-Rows>4</Actual-Rows>
44.             <Actual-Loops>1</Actual-Loops>
45.             <Plans>
46.               <Plan>
47.                 <Node-Type>Seq Scan</Node-Type>
48.                 <Parent-Relationship>Outer</Parent-Relationship>
49.                 <Relation-Name>h_lineitem</Relation-Name>
50.                 <Alias>h_lineitem</Alias>
51.                 <Startup-Cost>0.00</Startup-Cost>
52.                 <Total-Cost>250095.98</Total-Cost>
53.                 <Plan-Rows>5968209</Plan-Rows>
54.                 <Plan-Width>36</Plan-Width>
55.                 <Actual-Startup-Time>0.036</Actual-Startup-Time>
56.                 <Actual-Total-Time>7945.899</Actual-Total-Time>
57.                 <Actual-Rows>5996518</Actual-Rows>
58.                 <Actual-Loops>1</Actual-Loops>
59.                 <Filter>(l_shipdate &lt;= (to_date('1998/12/01'::text, 'YYYY/MM/DD'::text) - '10 days'::interval day))</Filter>
60.               </Plan>
61.             </Plans>
62.           </Plan>
63.         </Plans>
64.       </Plan>
65.     </explain>

--------------------------------------------------------------------------