protected StringBuilder appendStackFrame(StringBuilder sb, String clazz, String method, String line, String fileName) {
    sb.append("\n\tat ");
    sb.append(clazz).append(".").append(method);
    if (fileName != null) {
      sb.append("(");
      sb.append(fileName).append(".java");
      if (line != null) {
        sb.append(":").append(line);
      }
      sb.append(")");
    }
    return sb;
  }
Given a Document, converts the XML into a Vector of LoggingEvents.

@param document XML document
olv-core/src/main/java/pl/otros/logview/importer/UtilLoggingXmlLogImporter.java