src/plugin/parse-tika/src/java/org/apache/nutch/parse/tika/DOMBuilder.java [141:174]:
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  protected void append(Node newNode) throws org.xml.sax.SAXException {

    Node currentNode = m_currentNode;

    if (null != currentNode) {
      currentNode.appendChild(newNode);

      // System.out.println(newNode.getNodeName());
    } else if (null != m_docFrag) {
      m_docFrag.appendChild(newNode);
    } else {
      boolean ok = true;
      short type = newNode.getNodeType();

      if (type == Node.TEXT_NODE) {
        String data = newNode.getNodeValue();

        if ((null != data) && (data.trim().length() > 0)) {
          throw new org.xml.sax.SAXException(
              "Warning: can't output text before document element!  Ignoring...");
        }

        ok = false;
      } else if (type == Node.ELEMENT_NODE) {
        if (m_doc.getDocumentElement() != null) {
          throw new org.xml.sax.SAXException(
              "Can't have more than one root on a DOM!");
        }
      }

      if (ok)
        m_doc.appendChild(newNode);
    }
  }
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src/plugin/parse-html/src/java/org/apache/nutch/parse/html/DOMBuilder.java [136:169]:
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  protected void append(Node newNode) throws org.xml.sax.SAXException {

    Node currentNode = m_currentNode;

    if (null != currentNode) {
      currentNode.appendChild(newNode);

      // System.out.println(newNode.getNodeName());
    } else if (null != m_docFrag) {
      m_docFrag.appendChild(newNode);
    } else {
      boolean ok = true;
      short type = newNode.getNodeType();

      if (type == Node.TEXT_NODE) {
        String data = newNode.getNodeValue();

        if ((null != data) && (data.trim().length() > 0)) {
          throw new org.xml.sax.SAXException(
              "Warning: can't output text before document element!  Ignoring...");
        }

        ok = false;
      } else if (type == Node.ELEMENT_NODE) {
        if (m_doc.getDocumentElement() != null) {
          throw new org.xml.sax.SAXException(
              "Can't have more than one root on a DOM!");
        }
      }

      if (ok)
        m_doc.appendChild(newNode);
    }
  }
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