In many systems, such as SRB ( Storage Resource Broker(SRB) ), hierarchical directory structure is adopted to manage metadata. There are some simple facets because of the hierarchy and single frame characters of metadata. 在许多系统,比如SRB(StorageResourceBroker)中都采用层次目录结构管理元数据,由于元数据固有的层次性和结构单一性,这种管理方式有其方便简明的一面。