Drone / Video: a Drone may take many Videos; a Video is taken by one Drone. A Video instance is optional for a Drone; a Drone instance is required for a Video. A Facility may be recorded by many Videos; a Video records one Facility. A Video instance is optional for a Facility; a Facility instance is required for a Video. A Video may be the basis of many Analyses; an Analysis is based on one Video. An Analysis instance is optional for a Video; a Video instance is required for an Analysis

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Q: What is Attribute inheritance and its importance

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