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With inspiration from other libraries
There is a newer version: 2.12.15
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.sift;

import java.util.List;
import java.util.Map;

import ch.qos.logback.core.Appender;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.joran.GenericConfigurator;
import ch.qos.logback.core.joran.action.*;
import ch.qos.logback.core.joran.event.SaxEvent;
import ch.qos.logback.core.joran.spi.ElementSelector;
import ch.qos.logback.core.joran.spi.Interpreter;
import ch.qos.logback.core.joran.spi.JoranException;
import ch.qos.logback.core.joran.spi.RuleStore;

public abstract class SiftingJoranConfiguratorBase extends GenericConfigurator {

    protected final String key;
    protected final String value;
    // properties inherited from the main joran run
    protected final Map parentPropertyMap;

    protected SiftingJoranConfiguratorBase(String key, String value, Map parentPropertyMap) {
		this.key = key;
        this.value = value;
        this.parentPropertyMap = parentPropertyMap;
    }

    final static String ONE_AND_ONLY_ONE_URL = CoreConstants.CODES_URL + "#1andOnly1";

    @Override
    protected void addImplicitRules(Interpreter interpreter) {
        NestedComplexPropertyIA nestedComplexIA = new NestedComplexPropertyIA(getBeanDescriptionCache());
        nestedComplexIA.setContext(context);
        interpreter.addImplicitAction(nestedComplexIA);

        NestedBasicPropertyIA nestedSimpleIA = new NestedBasicPropertyIA(getBeanDescriptionCache());
        nestedSimpleIA.setContext(context);
        interpreter.addImplicitAction(nestedSimpleIA);
    }

    @Override
    protected void addInstanceRules(RuleStore rs) {
        rs.addRule(new ElementSelector("configuration/property"), new PropertyAction());
        rs.addRule(new ElementSelector("configuration/timestamp"), new TimestampAction());
        rs.addRule(new ElementSelector("configuration/define"), new DefinePropertyAction());
    }

    abstract public Appender getAppender();

    int errorEmmissionCount = 0;

    protected void oneAndOnlyOneCheck(Map appenderMap) {
        String errMsg = null;
        if (appenderMap.size() == 0) {
            errorEmmissionCount++;
            errMsg = "No nested appenders found within the  element in SiftingAppender.";
        } else if (appenderMap.size() > 1) {
            errorEmmissionCount++;
            errMsg = "Only and only one appender can be nested the  element in SiftingAppender. See also " + ONE_AND_ONLY_ONE_URL;
        }

        if (errMsg != null && errorEmmissionCount < CoreConstants.MAX_ERROR_COUNT) {
            addError(errMsg);
        }
    }

    public void doConfigure(final List eventList) throws JoranException {
        super.doConfigure(eventList);
    }

    @Override
    public String toString() {
        return this.getClass().getName() + "{" + key + "=" + value + '}';
    }
}