Update June 16, 2017: for a good, fairly comprehensive and freely downloadable set of sample DITA documents, I highly recommend checking out the Thunderbird documentation set on GitHub. For more information on what is there and how to access the DITA source files, see my article about it.
While there are many companies producing docs that use DITA XML, there still aren’t many examples of DITA-based source code (as opposed to the processed HTML/PDF output) to play with other than the simple “garage sample” that comes with the DITA Open Toolkit.
While other examples are few, they do exist.
Courtesy of the folks behind the DITA2InDesign plugin there are several extensive DITA source code examples derived from Project Gutenberg ebooks:
- Encyclopaedia Britannica 11th Edition, Vol 4, Part 3 of 4
- The Outline of Science, Volume 1 of 4
- T. S. Eliot’s The Waste Land
- Jules Verne’s 20,000 Leagues Under the Sea
If anyone knows of other DITA source code examples, please add them to the comments section below.