Copying a Subtree of Nodes from One DOM Document to Another
When copying a subtree of nodes from one document to another, cloning
the subtree and then inserting it into the other document will result
in a wrong document exception. The subtree of nodes must be
imported into the other document using importNode().
// Obtain an element in one document; the following method is implemented in
// The Quintessential Program to Create a DOM Document from an XML File
Document doc1 = parseXmlFile("infilename1.xml", false);
NodeList list = doc1.getElementsByTagName("entry");
Element element = (Element)list.item(0);
// Create another document
Document doc2 = parseXmlFile("infilename2.xml", false);
// Make a copy of the element subtree suitable for inserting into doc2
Node dup = doc2.importNode(element, true);
// Insert the copy into doc2
doc2.getDocumentElement().appendChild(dup);
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