下面这里面红色的字体都是干什么用的啊？？？？

Question

CREATE OR REPLACE PACKAGE TOS_SP_AGENTMSTVERSSC
AS
    TYPE AssocArrayChar_t     IS TABLE OF CHAR INDEX BY BINARY_INTEGER;
    TYPE CursorType           IS REF CURSOR;
    TYPE AssocArrayVarchar2_t IS TABLE OF VARCHAR2(1024) INDEX BY BINARY_INTEGER;
    TYPE AssocArrayNVarchar2_t IS TABLE OF NVARCHAR2(1024) INDEX BY BINARY_INTEGER;
    TYPE AssocArrayDate_t IS TABLE OF DATE INDEX BY BINARY_INTEGER;
    PROCEDURE GET_AGENTMSTVERS(v_agent_classvers IN VARCHAR2, v_seq IN VARCHAR2, v_facility_type_id IN VARCHAR2, v_withdata IN VARCHAR2, RefCur_MasterBO OUT CursorType, v_totalCount OUT VARCHAR2);
    PROCEDURE SET_AGENTMSTVERS(
                               V_AGENT_CLASS               IN AssocArrayVarchar2_t,
                               V_NEW_AGENT_CLASS           IN AssocArrayVarchar2_t,
                               V_SEQ                       IN AssocArrayVarchar2_t,
                               V_NEW_SEQ                   IN AssocArrayVarchar2_t,
                               V_CREATE_DTIME              IN AssocArrayDate_t,
                               V_CREATE_STAFF_ID           IN AssocArrayVarchar2_t,
                               V_CREATE_STAFF_NAME         IN AssocArrayNVarchar2_t,
                               V_FACILITY_TYPE_ID          IN AssocArrayVarchar2_t,
                               V_UN_AGENT_CLASS            IN AssocArrayVarchar2_t,
                               V_UPDATE_DTIME              IN AssocArrayDate_t,
                               V_UPDATE_STAFF_ID           IN AssocArrayVarchar2_t,
                               V_UPDATE_STAFF_NAME         IN AssocArrayNVarchar2_t,
                               V_ACTIONFLAG                IN AssocArrayChar_t,
                               RegistrationType            IN VARCHAR2,
                               ErrorInfo                   OUT CLOB,
                               SystemDate                  OUT DATE
                               ) ;
END;

Answer 1

加了”index by binary_integer ”后，类型的下标就是自增长，不需要初始化，不需要每次extend增加一个空间，而如果没有这句话“index by binary_integer”，那就得要显示对初始化，且每插入一个元素到table中时，都需要先extend

Answer 2

自定义数据类型,也叫ORACLE数据库对象。 像其他面向对象语言一样，ORACLE数据库对象也包括属性和方法。 
语法:
create type type_name as object (a number,b varchar2(10)，member function c return date);
而这个存储过程中的index by binary_integer，请看http://hi.baidu.com/hanbingxiaoshi/item/96ec1b2e4102120c72863eae