@Override
  public void processingInstruction(String target, String data) throws SAXException {
    throw new UnsupportedOperationException();
  }
Abstract for {@link XmlParser} that throws {@link UnsupportedOperationException} on unused
methods. Also keeps references for {@link #logWriter} and {@link #stack}


@since GemFire 8.1
geode-core/src/main/java/org/apache/geode/internal/cache/xmlcache/AbstractXmlParser.java