1. Alloy models from the covert project. http://www.sdalab.com/projects/covert. Alloy models from the covert project. http://www.sdalab.com/projects/covert.
2. Alloy models from the trademaker project. http://www.jazz.cs.virginia.edu: 8080/Trademaker/data/models.zip. Alloy models from the trademaker project. http://www.jazz.cs.virginia.edu: 8080/Trademaker/data/models.zip.
3. Moodle. http: //docs.moodle.org/dev/Grades#Database structures. Moodle. http: //docs.moodle.org/dev/Grades#Database structures.
4. Titanium. https://seal.ics.uci.edu/projects/titanium. Titanium. https://seal.ics.uci.edu/projects/titanium.
5. WordPress. http://codex.wordpress.org/Database Description/3.3. WordPress. http://codex.wordpress.org/Database Description/3.3.