    itemization(
    itt($$ = ) 

    A value is assigned to the rule's nonterminal's semantic value. The
right-hand side (rhs) of the assignment expression must be an expression of a
type that can be assigned to the tt(STYPE_) type.

    itt($$(expr))

    Same as the previous dollar-notation: tt(expr's) value is assigned to
the rule's nonterminal's semantic value.

    itt(_$$)

    This refers to the semantic value of the rule's nonterminal.

    itt($$)

    Same as the previous item: this refers to the semantic value of the rule's
nonterminal. 

    itt($$.)

    If tt(STYPE_) is a class-type then this dollar-notation is shorthand
for the member selector operator, applied to the rule's nonterminal's semantic
value.

    itt($$->)

    If tt(STYPE_) is a class-type then this dollar-notation is shorthand
for the pointer to member operator, applied to the rule's nonterminal's
semantic value.

    itt(_$1)

    This refers to the current production rule's first component's semantic
value.

    itt($1)

    Same as the previous dollar-notation: this refers to the 
current production rule's first component's semantic value.

    itt($1.)

    If tt(STYPE_) is a class-type then this dollar-notation is shorthand
for the member selector operator, applied to the current production rule's
first component's semantic value.

    itt($1->)

    If tt(STYPE_) is a class-type then this dollar-notation is shorthand
for the pointer to member operator, applied to the current production rule's
first component's semantic value.

    itt(_$-1)

    This refers to the semantic value of a component in a production rule,
listed immediately before the current rule's nonterminal ($-2 refers to a
component used two elements before the current nonterminal, etc.).

    itt($-1)

    Same as the previous item: this refers to the semantic value of a
component in a production rule, listed immediately before the current rule's
nonterminal.
 
    itt($-1.)

    If tt(STYPE_) is a class-type then this dollar-notation is shorthand
for the member selector operator, applied to the semantic value
of some production rule element, 1 element before the current rule's
nonterminal.

    itt($-1->)

    If tt(STYPE_) is a class-type then this dollar-notation is shorthand
for the pointer to member operator, applied to the semantic value
of some production rule element, 1 element before the current rule's
nonterminal.
    )
