During backup and restore of file system, it needs to merge current backup resource tree and previous one, namely operations between catalog tree and resource tree.
文件系统备份和恢复过程中，需根据当前备份资源树和历史备份资源树进行合并等操作，这种操作在物理上表现为对目录树和资源树的处理。
If the resource is not found on the calling element, the parent element in the logical tree is searched next, then the application, then themes, and finally system resources.
如果在呼叫项目上找不到资源，则会改以搜寻逻辑树状结构内的父项目，接著搜寻应用程式、布景主题，最后则会搜寻系统资源。
If the resource is not found on the calling element, the parent element in the logical tree is searched next, then the application, then themes, and finally system resources.
如果在呼叫项目上找不到资源，则会改以搜寻逻辑树状结构内的父项目，接著搜寻应用程式、布景主题，最后则会搜寻系统资源。
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