这个网格文件系统不仅需要存储区块，还要存储元数据信息，像目录、文件名、文件大小、最后修改时间等。
The grid file system needs to not only store chunks, but also metadata information, such as directories, files, file sizes, last modification times and so on.
MEF为组件提供了目录机制和丰富的元数据，使得组件可以被动态搜索到。
MEF provides a cataloging mechanism and rich metadata for components to allow them to dynamically discovered.
事件目录是事件元数据的存储库，它为用户提供指定事件定义的能力。
The Event catalog is a repository of event meta-data and provides the user with the ability to specify event definitions.
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