Which of the following BEST illustrates inheritance in frame-based representation?

Question

BlackTom AI · Accepted Answer

Frame-based knowledge representation organizes concepts as frames (similar to classes) that contain slots (attributes) and values; inheritance means a child frame automatically receives slots and default values from a parent frame unless overridden.

1) Relevant concepts:
- Frame: a structured record representing a concept (e.g., HUMAN, STUDENT) with named slots like has_limbs, breathes.
- Slot (attribute): a property of a frame.
- Inheritance: the mechanism where a more specific frame (child) acquires slots and values from a more general frame (parent), enabling reuse and specialization.

2) Step-by-step reasoning:
Step 1: Identify the hallmark of inheritance — sharing attributes from a general concept to a specific one.  
Step 2: Examine each option to see whether it demonstrates sharing attributes from a parent to a child frame.  
Step 3: Option A describes uniqueness (no sharing) — that contradicts inheritance.  
Step 4: Option B describes a frame interacting with an external database — this concerns data retrieval, not inheritance.  
Step 5: Option D describes rule-based IF-THEN logic — rules control behavior, not structural inheritance of slots.  
Step 6: Option C explicitly states a STUDENT frame shares the 'has_limbs' and 'breathes' attributes from a HUMAN parent frame — that is exactly inheritance: specialization (STUDENT) inherits general properties (HUMAN).

3) No numeric calculations are needed; the logical steps above show the inference.

4) Why C is correct:
It directly matches the definition of inheritance in frame-based systems: a child frame (STUDENT) inherits attributes and possibly default values from a parent frame (HUMAN). This demonstrates reuse and hierarchical organization.

5) Why other options are incorrect (brief):
- A: Unique attributes illustrate no inheritance.  
- B: External SQL retrieval is about data access, not structural inheritance.  
- D: Rule frames express procedural logic, not slot inheritance.

Conclusion: The correct choice is C. This matches the provided answer: "C. A STUDENT frame that shares the 'has_limbs' and 'breathes' attributes from a HUMAN parent frame."

Which of the following BEST illustrates inheritance in frame-based representation?Single choice

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