Namespace Xoops\Core
| Assets | Provides a standardized asset strategy |
| ComposerUtility | ComposerUtility |
| Events | Xoops Event processing, including preload mechanism |
| FilterInput | XoopsFilterInput is a class for filtering input from any data source |
| FixedGroups | FixedGroups provides constants for group ids that are fixed, and cannot be changed |
| HttpRequest | HttpRequest |
| Logger | Xoops\Core\Logger - dispatch log requests to any registered loggers. |
| MediaUploader | XOOPS file uploader |
| MimeTypes | MimeTypes |
| PreloadItem | PreloadItem used by modules to define preload event listeners |
| Psr0ClassLoader | SplClassLoader implementation that implements the technical interoperability standards for PHP 5.3 namespaces and class names. |
| Psr4ClassLoader | A Class Loader that implements the technical interoperability standards for PHP 5.3 namespaces and class names set forth in PSR-4. This general-purpose implementation includes the optional functionality of allowing multiple base directories for a single namespace prefix. |
| Random | XOOPS Random generator |
| Registry | Registry - a non-persisted key value store |
| Request | Request Class |
| Security | XOOPS security handler |
| XoopsTpl | XOOPS template engine class |
| Yaml | Yaml dump and parse methods |
| AttributeInterface | AttributeInterface - standard access to attributes |