Attributes .

. Each grammar production A a has associated with it a set of semantic rules of the form

b = f (c₁ , c₂ , ..., c_k )

where f is a function, and either

- b is a synthesized attribute of A OR

- b is an inherited attribute of one of the grammar symbols on the right

. attribute b depends on attributes c₁ , c₂ , ..., c_k

Dependence relation tells us what attributes we need to know before hand to calculate a particular attribute.

Here the value of the attribute b depends on the values of the attributes c₁ to c_k . If c₁ to c_k belong to the children nodes and b to A then b will be called a synthesized attribute. And if b belongs to one among a (child nodes) then it is an inherited attribute of one of the grammar symbols on the right.