> For the complete documentation index, see [llms.txt](https://docs.kognitos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kognitos.com/legacy/legacy-experience/books/custom-books/api-reference/enums.md).

# Enums

- [FilterBinaryOperator](https://docs.kognitos.com/legacy/legacy-experience/books/custom-books/api-reference/enums/filterbinaryoperator-enum.md)
- [FilterUnaryOperator](https://docs.kognitos.com/legacy/legacy-experience/books/custom-books/api-reference/enums/filterunaryoperator-enum.md)
- [Filter Expressions](https://docs.kognitos.com/legacy/legacy-experience/books/custom-books/api-reference/enums/filter-expressions.md): Learn about implementing filter expressions in your custom book project.