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Course<->topic relationship



Looking at data model, it seems that somewhat cleaner way to design
things is to make a _single_ top-level topic for a course.
Reasoning:
We will have subtopic lists, dependencies, etc. functionality in topic
class itself. Also problems and tests belong to topics, not to course.
Thus, course will be purely administrative unit, with no real content,
that links to top-level topic, which will drive the rest of learning
process.

Objections?

-- 
Ilya A. Volynets-Evenbakh
Total Knowledge. CTO
http://www.total-knowledge.com


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