<?xml version="1.0" encoding="UTF-8" ?>

<!-- This adds some functionality onto the log4j.dtd -->
<!-- Authors: Kevin Goess -->
<!-- Version: 1.0 -->


<!-- include the log4j dtd -->
<!ENTITY % log4j.dtd SYSTEM "log4j-1.2.dtd">  
%log4j.dtd;  


<!-- overriding log4j:configuration with log4perl:configuration
     so that we can use a log4perl:appender -->
<!ELEMENT log4perl:configuration (renderer*, log4perl:appender*, appender*,
                                  (log4perl:filter)*,(category|logger)*,root?, PatternLayout?)>

<!ATTLIST log4perl:configuration
  xmlns:log4perl              CDATA #FIXED "http://log4perl.sourceforge.net/" 
  threshold                (all|debug|info|warn|error|fatal|off|null) "null"
  debug                    (true|false|null)  "null"
  oneMessagePerAppender    (true|false|null) "null"
>


<!-- overriding log4j's appender with log4perl:appender so can include
     other kinds of param structures -->
<!ELEMENT log4perl:appender     (errorHandler?, (param|param-nested|param-text)*, 
                                 (layout|log4perl:layout)?, filter*, filter-ref*, appender-ref*)>
<!ATTLIST log4perl:appender
   xmlns:log4perl CDATA #FIXED "http://log4perl.sourceforge.net/"
  name 		ID 	#REQUIRED
  class 	CDATA	#REQUIRED
>

<!-- a complex param type -->
<!ELEMENT param-nested ((param|param-nested|param-text)+)>
<!ATTLIST param-nested
  name          CDATA   #REQUIRED
>


<!-- so you can put the value in the text instead of always having to 
     put it in the attribute -->
<!ELEMENT param-text (#PCDATA)>
<!ATTLIST param-text
  name          CDATA #REQUIRED
>

<!-- a top-level PatternLayout to handle global cspecs -->
<!ELEMENT PatternLayout (cspec+)>

<!-- custom conversion specifiers -->
<!ELEMENT cspec (#PCDATA)>
<!ATTLIST cspec
  name          CDATA #REQUIRED
>


<!ELEMENT log4perl:layout ((param|cspec)*)>
<!ATTLIST log4perl:layout
  class		CDATA	#REQUIRED
>

<!-- This is the filter at the document root, as opposed to the appender
       children filters.  This implement the log4perl-specific boolean appenders
-->
<!ELEMENT log4perl:filter (#PCDATA|param|param-nested|param-text)*>
<!ATTLIST log4perl:filter 
      class		CDATA	 #IMPLIED
      name     CDATA    #IMPLIED
      value     CDATA    #IMPLIED
>

<!ELEMENT filter-ref EMPTY>
<!ATTLIST filter-ref id  NMTOKEN #REQUIRED>