Here is an example of using the XMLLayout class from the logback-classic library in Java:

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.FileAppender;
import ch.qos.logback.core.encoder.Encoder;
import ch.qos.logback.core.spi.ContextAwareBase;
import ch.qos.logback.core.spi.LifeCycle;

public class LogbackExample {
  public static void main(String[] args) {
    LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
    FileAppender<ILoggingEvent> fileAppender = new FileAppender<>();
    fileAppender.setContext(context);
    fileAppender.setFile("logfile.xml");
    
    Encoder<ILoggingEvent> encoder = new XMLLayoutEncoder();
    fileAppender.setEncoder(encoder);
    fileAppender.start();

    Logger logger = LoggerFactory.getLogger(LogbackExample.class);
    logger.addAppender(fileAppender);
    
    logger.info("This is an informational message");
    logger.debug("This is a debug message");
    logger.error("This is an error message", new Exception("This is an exception"));
  }
}

This example creates a logger for the LogbackExample class and sets up a file appender using an XMLLayoutEncoder encoder. The log messages will be written to the file logfile.xml in XML format. This is example that shows basic logging usage, as it may vary based on your specific requirement and customizations.