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    <ol> <li>Iterate over all the node_id elements in file2. </li> <li>For each one, look up corresponding node_x element in file1. </li> <li>Add node_x from file1 into file2</li> </ol> <p>The following code illustrates this:</p> <pre><code>DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); //build DOMs Document doc1 = builder.parse(new File("file1.xml")); Document doc2 = builder.parse(new File("file2.xml")); //get all node_ids from doc2 and iterate NodeList list = doc2.getElementsByTagName("node_id"); for(int i = 0 ; i&lt; list.getLength() ; i++){ Node n = list.item(i); //extract the id String id = n.getTextContent(); //now get all node_id elements from doc1 NodeList list2 = doc1.getElementsByTagName("node_"+id); for(int j = 0 ; j&lt; list2.getLength() ; j++){ Node m = list2.item(j); //import them into doc2 Node imp = doc2.importNode(m,true); n.getParent().appendChild(imp); } } //write out the modified document to a new file TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer transformer = tFactory.newTransformer(); Source source = new DOMSource(doc2); Result output = new StreamResult(new File("merged.xml")); transformer.transform(source, output); </code></pre> <p>The result would be: </p> <pre><code>&lt;root&gt; &lt;node&gt; &lt;node_id&gt;1&lt;/node_id&gt; &lt;node_1&gt;This is 1&lt;/node_1&gt; &lt;/node&gt; &lt;node&gt; &lt;node_id&gt;2&lt;/node_id&gt; &lt;node_2&gt;This is 2&lt;/node_2&gt; &lt;/node&gt; &lt;node&gt; &lt;node_id&gt;3&lt;/node_id&gt; &lt;node_3&gt;This is 3&lt;/node_3&gt; &lt;/node&gt; &lt;/root&gt; </code></pre>
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    1. COOh great :) i am so thankful to you. This is what exactly i was looking for.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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