/src/main/java/org/htmlunit/util/XmlUtils.java
if ( documentType != null) {
if ( documentType != null && page instanceof XmlPage ) {
final boolean handleXHTMLAsHTML) { appendChild(page, parent, child, handleXHTMLAsHTML, null); } public static void appendChild(final SgmlPage page, final DomNode parent, final Node child, final boolean handleXHTMLAsHTML, final Map<Integer, List<String>> attributesOrderMap) { final DocumentType documentType = child.getOwnerDocument().getDoctype(); <extra_id_0> final DomDocumentType domDoctype = new DomDocumentType( page, documentType.getName(), documentType.getPublicId(), documentType.getSystemId()); ((XmlPage) page).setDocumentType(domDoctype); } final DomNode childXml = createFrom(page, child, handleXHTMLAsHTML, attributesOrderMap); parent.appendChild(childXml);