Attributes .

. . attributes fall into two classes: synthesized and inherited

. value of a synthesized attribute is computed from the values of its children nodes

. value of an inherited attribute is computed from the sibling and parent nodes

The attributes are divided into two groups, called synthesized attributes and inherited attributes . The synthesized attributes are the result of the attribute evaluation rules also using the values of the inherited attributes. The values of the inherited attributes are inherited from parent nodes and siblings.