1. Darwin: it uses the principles of specialization and inheritance
2. Information Typing: it capitalizes on the semantics of topics (concept, task, reference) and of content (messages, typed phrases, semantic tables)
3. Architecture: it provides vertical headroom (new applications) and edgewise extension (specialization into new types) for information

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Although XMetaL docs do a good job explaining the application, and how it works with DITA, they don't provide any "how to" information for new users that need to alter the appearance of their docs to accommodate their company's standards. So, I got a preliminary doc from XMetaL, "Customizing DITA PDF Output."

Although I had to burn a Support credit, the doc has been very helpful. However, I cannot get the output I expect. I decided to start with a simple change to the title page, according to the
instructions in their doc.

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