<?xml version="1.0" encoding="UTF-8" ?>
        <!--
         Licensed to the Apache Software Foundation (ASF) under one or more
         contributor license agreements.  See the NOTICE file distributed with
         this work for additional information regarding copyright ownership.
         The ASF licenses this file to You under the Apache License, Version 2.0
         (the "License"); you may not use this file except in compliance with
         the License.  You may obtain a copy of the License at

              http://www.apache.org/licenses/LICENSE-2.0

         Unless required by applicable law or agreed to in writing, software
         distributed under the License is distributed on an "AS IS" BASIS,
         WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
         See the License for the specific language governing permissions and
         limitations under the License.
         -->
        <!-- Authors: Chris Taylor, Ceki Gülcü. -->
        <!-- Version: 1.2 -->

        <!-- PHP Port Modifications Author: Marco Vassura -->
        <!-- PHP dtd Version: $Revision: 823875 $ -->

        <!-- A configuration element consists of optional renderer
        elements,appender elements, categories and an optional root
        element. -->
        <!-- [log4php] -->
        <!--
            category instead of logger cannot be used. categoryFactory is not implemented in log4php.
        -->
        <!-- [/log4php] -->
        <!ELEMENT log4php:configuration (renderer*, appender*,(logger)*,root?)>

        <!-- The "threshold" attribute takes a level value such that all -->
        <!-- logging statements with a level equal or below this value are -->
        <!-- disabled. -->

        <!-- Setting the "debug" enable the printing of internal log4j logging   -->
        <!-- statements.                                                         -->

        <!-- By default, debug attribute is "null", meaning that we not do touch -->
        <!-- internal log4j logging settings. The "null" value for the threshold -->
        <!-- attribute can be misleading. The threshold field of a repository    -->
        <!-- cannot be set to null. The "null" value for the threshold attribute -->
        <!-- simply means don't touch the threshold field, the threshold field   -->
        <!-- keeps its old value.                                                -->

        <!ATTLIST log4php:configuration
                xmlns:log4php            CDATA #FIXED "http://logging.apache.org/log4php"
                threshold                (all|debug|info|warn|error|fatal|off|null) "null"
                >

        <!-- renderer elements allow the user to customize the conversion of  -->
        <!-- message objects to String.                                       -->
        <!ELEMENT renderer EMPTY>
        <!ATTLIST renderer
                renderedClass  CDATA #REQUIRED
                renderingClass CDATA #REQUIRED
                >

        <!-- Appenders must have a name and a class. -->
        <!-- Appenders may contain an error handler, a layout, optional parameters -->
        <!-- and filters. They may also reference (or include) other appenders. -->
        <!-- [log4php] -->
        <!-- error handler tag has no effects since log4php does not handle errors. Defintion deleted. -->
        <!-- [/log4php] -->
        <!ELEMENT appender (param*, layout?, filter*, appender-ref*)>
        <!ATTLIST appender
                name      ID  #REQUIRED
                class     CDATA   #REQUIRED
                >

        <!ELEMENT layout (param*)>
        <!ATTLIST layout
                class     CDATA   #REQUIRED
                >

        <!ELEMENT filter (param*)>
        <!ATTLIST filter
                class     CDATA   #REQUIRED
                >


        <!ELEMENT param EMPTY>
        <!ATTLIST param
                name      CDATA   #REQUIRED
                value     CDATA   #REQUIRED
                >

        <!ELEMENT priority EMPTY>
        <!ATTLIST priority
                value   CDATA #REQUIRED
                >

        <!ELEMENT level EMPTY>
        <!ATTLIST level
                value   CDATA #REQUIRED
                >

        <!-- If no level element is specified, then the configurator MUST not -->
        <!-- touch the level of the named logger. -->
        <!ELEMENT logger (level?,appender-ref*)>
        <!ATTLIST logger
                name      ID  #REQUIRED
                additivity    (true|false) "true"
                >

        <!ELEMENT appender-ref EMPTY>
        <!ATTLIST appender-ref
                ref IDREF #REQUIRED
                >

        <!-- If no priority element is specified, then the configurator MUST not -->
        <!-- touch the priority of root. -->
        <!-- The root category always exists and cannot be subclassed. -->
        <!ELEMENT root (param*, (priority|level)?, appender-ref*)>


        <!-- ==================================================================== -->
        <!--                       A logging event                                -->
        <!-- ==================================================================== -->
        <!ELEMENT log4php:eventSet (log4php:event*)>
        <!ATTLIST log4php:eventSet
                xmlns:log4php          CDATA #FIXED "http://www.vxr.it/log4php/"
                version                (0.2|0.3) "0.3"
                includesLocationInfo   (true|false) "true"
                >

        <!ELEMENT log4php:event (log4php:message, log4php:locationInfo?) >

        <!-- The timestamp format is application dependent. -->
        <!ATTLIST log4php:event
                logger     CDATA #REQUIRED
                level      CDATA #REQUIRED
                thread     CDATA #REQUIRED
                timestamp  CDATA #REQUIRED
                >

        <!ELEMENT log4php:message (#PCDATA)>
        <!ELEMENT log4php:NDC (#PCDATA)>

        <!ELEMENT log4php:locationInfo EMPTY>
        <!ATTLIST log4php:locationInfo
                class  CDATA  #REQUIRED
                method CDATA  #REQUIRED
                file   CDATA  #REQUIRED
                line   CDATA  #REQUIRED
                >