> For the complete documentation index, see [llms.txt](https://xoops.gitbook.io/xoops-modules-cookbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes.md).

# Core Classes

- [Classes](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes/core.md)
- [Key Classes](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes/core/key-classes.md)
- [Helper Class](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes/core/helper-class.md)
- [Criteria](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes/core/criteria.md)
- [XoopsObject](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes/core/xoopsobject.md)
- [XoopsObject & XoopsObjectHandler](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes/core/xoopsobjectandhandler.md)
- [XoopsObjectHandler & XoopsPersistableObjectHandler](https://xoops.gitbook.io/xoops-modules-cookbook/core-classes/core/xoopspersistableobjecthandler.md)