dom w3c dom DOMException w3c dom DOMImplementation w3c dom w3c dom DocumentType w3c dom domimplementationimpl coredomimplementationimpl domimplementation domimplementationimpl singleton domimplementationimpl domimplementation getdomimplementation singleton hasfeature feature version super.hasfeature feature version anyversion version version.length feature.startswith feature feature.substring feature.equalsignorecase anyversion version.equals feature.equalsignorecase anyversion version.equals feature.equalsignorecase anyversion version.equals feature.equalsignorecase anyversion version.equals feature.equalsignorecase anyversion version.equals createdocument namespaceuri qualifiedname documenttype doctype domexception doctype doctype.getownerdocument msg dommessageformatter.formatmessage dommessageformatter.dom_domain domexception domexception.wrong_document_err msg documentimpl doc documentimpl doctype qualifiedname namespaceuri doc.createelementns namespaceuri qualifiedname doc.appendchild doc