As more and more sensitive information gets stored in the form of XML, proper access control to the XML documents becomes increasingly important. Moreover, XML documents may be available to users at certain time periods, and unavailable at others. To tackle such dynamic aspects, this paper proposes a bitmap-indexing scheme in which timed access control decisions can be effectively processed. The form (Autht, Autho) is used to present authorization policies which are encoded as bitmaps in the same manner as XML document indexes are constructed.
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机译：随着越来越多的敏感信息以XML形式存储，对XML文档的正确访问控制变得越来越重要。此外，XML文档在某些时间段可能对用户可用，而在其他时间段则不可用。为了解决这些动态方面，本文提出了一种位图索引方案，其中可以有效地处理定时访问控制决策。形式（Auth t ，Auth o ）用于呈现授权策略，这些授权策略以与构造XML文档索引相同的方式编码为位图。
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