How to learn the Message type?

Hello, my friends. Every record contains a type field.It's about the message type such as AUDIT_AVC, AUDIT_SYSCALL and so on. Does AVC mean Mandatory Access Control ? Is all the messag types listed in msg_typetab.h? What do they mean exactly? Where can I get the information about them ? I look into the _LIBAUDIT_H_ , and find this sentence * 1300 - 1399 audit event messages But in this file , I find nothing about audit event message Can anyone give me an URL or give a book for me about the audit event message? Thanks a lot ^_^ Jeedan -- ----------------------------- 陈洁丹 北京邮电大学软件学院 地 址： 北京邮电大学学二D12寝室 邮 编： 100876 Email: jeedan.chen(a)gmail.com ---------------------------------