code: private void emitQName(final QName tag) throws IOException {
      nameSpaces.emitNsAbbr(tag.getNamespaceURI(), wtr);
  
      out(tag.getLocalPart());
  
      emitNs();
    }
docs: /* Write out the tag name, adding the ns abbreviation.
  Also add the namespace declarations if this is the first tag
  
  @param tag
  @throws IOException