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+\$cache\_id {#variable.cache.id}
+===========
+
+Persistent cache\_id identifier. As an alternative to passing the same
+`$cache_id` to each and every function call, you can set this
+`$cache_id` and it will be used implicitly thereafter.
+
+With a `$cache_id` you can have multiple cache files for a single call
+to [`display()`](#api.display) or [`fetch()`](#api.fetch) depending for
+example from different content of the same template. See the [caching
+section](#caching) for more information.