https://www.youtube.com/watch?v=M4B4bi7R5SI&list=PL68DA95F8E2B15DD4&index=3
Nodes & Sources can be classified for assigning demographic data such as age and gender for people. One classification can have different attributes. For people age and gender are attributes of that group. Then each attribute can have a value. Like age that has its own value for each individual.
In my coding, for my resources I considered 'course' as a classification, and assigning two attributes course type and year. Year can get the value of 1, 2, 3 and 4.
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