The xml data cache class includes two caching methods: one is based on a list, such as displaying information according to a certain category and searching for a certain keyword; the other is caching of detailed pages, such as displaying a specific articles.
This class has nothing to do with specific business logic. It is only responsible for reading and storing xml data. It determines whether the cache has expired and whether the cache needs to be updated. According to the three-tier architecture model, it is in the data access layer.
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