log4net - where do I find XML DTDs or Schema refer

Question

This question already has an answer here:

• Log4Net “Could not find schema information” messages 13 answers

Where do I find XML DTDs or Schema references for things like log4net.Appender.FileAppender configuration?

Answer 1

In this question someone provides a link (second answer) to a xsd schema definition that you can find here. Log4net does not provide a schema definition as far as I know.