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The notation we will use will be of the form:
a: A, b: B, ... --> composite-expression: composite-attribute
          a, b,
          etc. are the operands. A,
          B, etc. are the operand's
          attribute types. composite-expression
          is the expression involving the operands and composite-attribute
          is the resulting attribute type of the composite expression.
        
For instance:
a: A, b: B --> (a >> b): tuple<A, B>
          reads as: given, a and
          b are parsers, and A is the type of the attribute of a, and B
          is the type of the attribute of b,
          then the type of the attribute of a
          >> b
          will be tuple<A, B>.
        
| ![[Important]](../../../images/important.png) | Important | 
|---|---|
| 
            In the attribute tables, we will use  | 
| Expression | Attribute | 
|---|---|
| 
                    Sequence
                    ( | 
 a: A, b: B --> (a >> b): tuple<A, B> a: A, b: Unused --> (a >> b): A a: Unused, b: B --> (a >> b): B a: Unused, b: Unused --> (a >> b): Unused a: A, b: A --> (a >> b): vector<A> a: vector<A>, b: A --> (a >> b): vector<A> a: A, b: vector<A> --> (a >> b): vector<A> a: vector<A>, b: vector<A> --> (a >> b): vector<A> 
 | 
| 
                    Expect
                    ( | 
 a: A, b: B --> (a > b): tuple<A, B> a: A, b: Unused --> (a > b): A a: Unused, b: B --> (a > b): B a: Unused, b: Unused --> (a > b): Unused a: A, b: A --> (a > b): vector<A> a: vector<A>, b: A --> (a > b): vector<A> a: A, b: vector<A> --> (a > b): vector<A> a: vector<A>, b: vector<A> --> (a > b): vector<A> 
 | 
| 
                    Alternative
                    ( | 
 a: A, b: B --> (a | b): variant<A, B> a: A, b: Unused --> (a | b): optional<A> a: A, b: B, c: Unused --> (a | b | c): optional<variant<A, B> > a: Unused, b: B --> (a | b): optional<B> a: Unused, b: Unused --> (a | b): Unused a: A, b: A --> (a | b): A 
 | 
| 
                    Difference
                    ( | 
 a: A, b: B --> (a - b): A a: Unused, b: B --> (a - b): Unused 
 | 
| 
                    Kleene
                    ( | 
 a: A --> *a: vector<A> a: Unused --> *a: Unused 
 | 
| 
                    Plus
                    ( | 
 a: A --> +a: vector<A> a: Unused --> +a: Unused 
 | 
| 
                    List
                    ( | 
 a: A, b: B --> (a % b): vector<A> a: Unused, b: B --> (a % b): Unused 
 | 
| 
 a: A --> repeat(...,...)[a]: vector<A> a: Unused --> repeat(...,...)[a]: Unused 
 | |
| 
                    Sequential
                    Or ( | 
 a: A, b: B --> (a || b): tuple<optional<A>, optional<B> > a: A, b: Unused --> (a || b): optional<A> a: Unused, b: B --> (a || b): optional<B> a: Unused, b: Unused --> (a || b): Unused a: A, b: A --> (a || b): vector<optional<A> > 
 | 
| 
                    Optional
                    ( | 
 a: A --> -a: optional<A> a: Unused --> -a: Unused 
 | 
| 
                     | 
                     | 
| 
                     | 
                     | 
| 
                    Permutation
                    ( | 
 a: A, b: B --> (a ^ b): tuple<optional<A>, optional<B> > a: A, b: Unused --> (a ^ b): optional<A> a: Unused, b: B --> (a ^ b): optional<B> a: Unused, b: Unused --> (a ^ b): Unused 
 |