| Node | remarks |
| knowledge | Knowledge point entity, which stores the knowledge points possessed by professional courses. Attribute value: “id” is the unique identifier of knowledge point entity, and “name” indicates the name of knowledge point. |
| course | Course entity, which store courses on MOOC platform. Attribute value: “id” is the unique identification of the course entity, and “name” indicates the course name. |
| teacher | Teacher entity, which stores the lecturers on MOOC platform. Attribute value: “id” is the unique identifier of the teacher entity, and “name” indicates the teacher’s name. |
| university | University entity, which stores the universities on the MOOC platform. Attribute value: “id” is the unique identification of the university entity, and “name” indicates the name of the university. |
| type | Type, which stores the course categories existing on MOOC platform. Attribute value: “id” is the unique identifier of the category entity, and “name” indicates the category name. |
| video | Video entity, which stores videos of courses on MOOC platform. Attribute value: “id” is the unique identifier of video entity, “video” indicates the video name, and “link” indicates the link address of the vide |
| question | Test questions entity, which stores the exercises of courses on MOOC platform. Attribute value: “id” is the unique identification of the test questions entity, “name” indicates the name of the test question, and “link”: indicates the link address of the exercise. |