| 摘要 |
An online content system is provided, including a plurality of user accounts maintained at a network-accessible online service, where associated with each user account are a plurality of content items. A catalog service is operable to provide offline metadata for the plurality of user accounts, whereby, for the plurality of content items in each of the plurality of user accounts, (a) a catalog engine of the catalog service is operable to generate a hierarchical tree descriptor for the plurality of content items, and (b) a service interface of the catalog service is operable to cause network transmission of the hierarchical tree descriptor to a remote device associated with the user account, such network transmission being independent of content item downloads to the remote device.
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