Yodl stands for `Your Own Document Language' (originally: Yet Oneother Document Language) and is basically a pre-processor to convert document files in a special macro language (the Yodl language) to any output format. The Yodl language is not a `final' language, in the sense that it can be viewed or printed directly. Rather, a document in the Yodl language is a `pre-document', that is converted with some macro package to an output format, to be further processed.