src/main/java/org/apache/log4j/filter/AndFilter.java [123:136]:
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  public boolean parseUnrecognizedElement(final Element element,
                                          final Properties props) throws Exception {
      final String nodeName = element.getNodeName();
      if ("filter".equals(nodeName)) {
          OptionHandler filter =
                  org.apache.log4j.extras.DOMConfigurator.parseElement(
                          element, props, Filter.class);
          if (filter instanceof Filter) {
              filter.activateOptions();
              this.addFilter((Filter) filter);
          }
          return true;
      }
      return false;
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src/main/java/org/apache/log4j/rolling/FilterBasedTriggeringPolicy.java [140:153]:
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  public boolean parseUnrecognizedElement(final Element element,
                                          final Properties props) throws Exception {
      final String nodeName = element.getNodeName();
      if ("filter".equals(nodeName)) {
          OptionHandler filter =
                  org.apache.log4j.extras.DOMConfigurator.parseElement(
                          element, props, Filter.class);
          if (filter instanceof Filter) {
              filter.activateOptions();
              this.addFilter((Filter) filter);
          }
          return true;
      }
      return false;
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