次の関数は Document をコピーし、基本的な を保持しますが<!DOCTYPE>、これは の使用には当てはまりませんTransformer。
public static Document copyDocument(Document input) {
DocumentType oldDocType = input.getDoctype();
DocumentType newDocType = null;
Document newDoc;
String oldNamespaceUri = input.getDocumentElement().getNamespaceURI();
if (oldDocType != null) {
// cloning doctypes is 'implementation dependent'
String oldDocTypeName = oldDocType.getName();
newDocType = input.getImplementation().createDocumentType(oldDocTypeName,
oldDocType.getPublicId(),
oldDocType.getSystemId());
newDoc = input.getImplementation().createDocument(oldNamespaceUri, oldDocTypeName,
newDocType);
} else {
newDoc = input.getImplementation().createDocument(oldNamespaceUri,
input.getDocumentElement().getNodeName(),
null);
}
Element newDocElement = (Element)newDoc.importNode(input.getDocumentElement(), true);
newDoc.replaceChild(newDocElement, newDoc.getDocumentElement());
return newDoc;
}