Re: [PR] Expanded more elements to Log4j-config.xsd (logging-log4j2)

["krallus (via GitHub)" <gi...@apache.org>]

krallus commented on PR #1441:
URL: https://github.com/apache/logging-log4j2/pull/1441#issuecomment-2272170491

   Thank you.  I ran into a some problems using the new one at https://logging.apache.org/xml/ns/.
   Here is a simple `log4j2.xml`:
   ```xml
   <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE Configuration>
   <Configuration xmlns="https://logging.apache.org/xml/ns"
   	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   	xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-config-2.xsd"
   	status="WARN">
   	<Properties>
   		<Property name="root.logging.level">${sys:myapp.root.logging.level:-${sys:rootLogger.level:-WARN}}</Property>
   	</Properties>
   	<Appenders>
   		<Console name="Console" target="SYSTEM_OUT">
   			<PatternLayout pattern="%date{ABSOLUTE} %class %method - %message%n%throwable" />
   		</Console>
   	</Appenders>
   	<Loggers>
   		<Root level="${root.logging.level}">
   			<AppenderRef ref="Console" />
   		</Root>
   	</Loggers>
   </Configuration>
   ```
   
   The new XSD incorrectly points out two problems:
   
   1. It doesn't like the way I've set the value for a Property: as content. However, that is one of the ways shown in the example at https://logging.apache.org/log4j/2.x/manual/configuration.html#concise-syntax. Currently, it will only validate if I set the value using the `value` attribute.
   2. More significantly, it does not accept "${root.logging.level}" for Root's `level`, which is using [Property Substitution](https://logging.apache.org/log4j/2.x/manual/configuration.html#PropertySubstitution).
   
   Note that the use case for the way I've written the above configuration is that if I start my Java Virtual Machine with `-Dmyapp.root.logging.level=DEBUG` (or some other level), it will use that for the root logger if it is set, otherwise it defaults to WARN.


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