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Question

What is a limitation of using formal context-free grammar notations, such as BNF, to describe interactive system dialogs?

a.

They cannot handle command-based interfaces effectively.

b.

They are not suitable for graphically-based interactions.

c.

They lack directionality information for dialog events.

d.

They are unable to represent state transitions.

Answer: (c).They lack directionality information for dialog events. Explanation:Formal context-free grammar notations like BNF are limited in expressing the directionality associated with each event in the dialog. This makes it challenging to model communication of values and semantic feedback between application and presentation.

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Q. What is a limitation of using formal context-free grammar notations, such as BNF, to describe interactive system dialogs?

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