@uml
Constructs a new instance of {@link TokenTagToken} with the specified
token name, type, and label.
@param tokenName The token name.
@param type The token type.
@param label The label associated with the token tag, or {@code null} if
the token tag is unlabeled.
@uml Constructs a new instance of {@link TokenTagToken} with the specified token name, type, and label.
@param tokenName The token name. @param type The token type. @param label The label associated with the token tag, or {@code null} if the token tag is unlabeled.