Attributes in syntax directed translation

Question

Attributes are said to be of two type, synthesised and inherited. What actually is an attribute? Why an attribute exist, how to define it?

Answer 1

Good Question.

Here is a snippet from the dragon book which will help you understand what an attribute is

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Answer 2

An attribute is a characteristic of an object or entity that can be used to describe it. Attributes exist in order to provide information about an object or entity, and can be used to differentiate between different objects or entities. Attributes can be synthesized or inherited, meaning they can either be specific to the particular object or entity in question, or they can be taken from another object or entity.