| 摘要 |
A computer system comprises a plurality of files, whereby at least one of said plurality of files has associated with it first metadata defining an action to be performed (e.g. expiry of the file) and second metadata defining a date/time at which said action is to be performed (e.g. deletion, marking the file out of date), whereby the computer system detects the first and second metadata and performs the action if the date/time correspond to a present date/time. The computer system may carry out a regular scan of the plurality of files to determine which of said plurality of files require action according to the second metadata.
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