[logback-user] configuration - why no DTD?

Now that I have logback working, I can't figure out the whole syntax of the logback.xml file - why is there no DTD? All the examples show only a single appender and one root element. How would I, for example, add a console appender and a fileappender to the root? Or add a appender at another level? Documentation needs to be better, since confusion about configuration is likely to stop people from trying it. - andrew