visa维护用户的安全上下文，即登录数据(用来向IBM Cognos 8验证身份的数据)和用户的身份(用户所属的组和角色)。
A Visa maintains the user's security context, that is the logon data (whatever was used to authenticate to IBM Cognos 8), and his identity (the groups and roles he's a member of).
公开给多个并且可能是未知用户的服务需要在安全性、可靠性、可维护性、可伸缩性和治理性方面得到增强。
A service exposed to multiple, potentially unknown consumers will need to be strengthened in terms of security, reliability, maintainability, scalability, and governance.
在业务方法中确保安全：这就意味着在每条评论里都维护一份所有有权限用户的记录，然后用提供的令牌与这些用户做比照。
Enforce security in your business methods: Basically, that means keeping a reference inside each Comment to all users who have access, and then compare these users to the provided Token.
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