#013187: Explanation of Cache keys

This seems to be wrong or misleading:

"This parameter can be used to define the uniqueness of a cache block. When the value changes, the cache block will be renewed. "

I do not know, how the template caching in ezc works, but in eZP there is one stored cache block for any combination of keys. Maybe this would be better:

"This parameter can be used to define the uniqueness of a cache block. For every different value of the parameter, a separate file is stored on the disc, containing the output of the cache block. If the template is processed again with the same parameter, then the content of the cache file is used instead of processing the cache block again."

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PHP Version: (please be specific, like '4.4.3' or '5.1.5')
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