type="Memory", this storage option just tracks data in-memory and does not persist it across restarts of the shibd daemon. This is the simplest option, and generally the best choice.
Settings specific to this type include:
|time in seconds||900|
Interval in seconds between cleanup runs, when expired entries are swept from memory by a background thread
plugin types support the following attributes:
Specifies the type of StorageService plugin
|XML ID||A unique identifier within the configuration file that labels the plugin instance so other plugins can reference it|
<StorageService type="Memory" id="mem" cleanupInterval="900"/>