Let’s look at the history of the MLs a little bit. Those are the markup languages for computer text processing.
Markup languages started appearing in the 1960s. At that time, if you were a publisher, you would have your pages typeset by a professional typesetter or a typesetting company. The typesetters used to encode your data so that you couldn’t see the results until they generated the pages. The problem was that once a publisher had a large corpus of their publications set with a typesetter, they were handcuffed. They couldn’t leave very easily. Their data was so tied up with some particular typesetting system, the Penta system or whatever they were involved with. They couldn’t migrate. They couldn’t move. So, they were kind of imprisoned. The price kept going up every year because, well, “Where are you going to go? Hah!” It was very frustrating.