| EXAMPLE |
| CACHE_COMMON_API_INTERFACE | interface CACHE_COMMON_API_INTERFACE |
| PHP_SESSION | Interface PHP_SESSION |
| STATIC_API_INTERFACE | for static implementations |
| CACHE_API2 | Class CACHE_API2 |
| FILECACHE_API | class FILECACHE_API |
| MEMCACHED | Class MEMCACHED |
| REDIS | Class REDIS |
| SESSION | Interface SESSION |
| XCACHE | class XCACHE |
| XCACHE_static | Class XCACHE_static |