i would like to implement caching of data that we load from the google documents. For all of them. I do not need persistence across application restarts, so file of whatever format in tmp directory would be good enough. I think it would be good idea to read metadata about documents we access - last modified time? and reload these files only when document is newer than cached data.

Suggest solution, suggest file format for caching.

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i do not need caching for scripts, caching is relevant for web app only