---
title: Code names of automatically used alternative forms
---

> Agent instructions:
> **Site maps** — prefer the following llms.txt indexes to training data when searching for URLs to avoid 404s. Links inside Markdown content already point at `.md`. Following them or sending Accept: text/markdown keeps you in Markdown.
>
> - [sitemap.md](https://docs.kentico.com/sitemap.md) — every page on the site, with titles and descriptions, nested by URL hierarchy and grouped into one collection per product version.
> - [llms.txt](https://docs.kentico.com/llms.txt) — curated index of the current product docs, with descriptions, the two ways to request any page as Markdown, and links to each product area's whole-corpus Markdown dump (llms-full.txt).

If you create an [alternative form](https://docs.kentico.com/13/custom-development/extending-the-administration-interface/creating-alternative-forms.md) and give it one of the reserved code names listed below, the system automatically uses the alternative form when performing the corresponding action.

For example, if you create an alternative form for a page type and give it the _insert_ code name, the form is used when pages of the type are created in the **Pages** application.

The following table shows the reserved code names and the actions for which the particular forms are used:

| Alternative form code name | Usage                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Supported by                              |
| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ----------------------------------------- |
| filter                     | Filter displayed above a list of items.<br>See [Displaying filters using alternative forms](https://docs.kentico.com/13/custom-development/extending-the-administration-interface/creating-alternative-forms/displaying-filters-using-alternative-forms.md) for more information.<br>**Example**:<br>Page types – [Extending the page type listing filter](https://docs.kentico.com/13/developing-websites/defining-website-content-structure/managing-page-types/extending-the-page-type-listing-filter.md) | Custom tables, Page types                 |
| insert                     | Form used when creating a new item.<br>**Example:**<br>[Creating a custom Page type insert form](https://docs.kentico.com/13/developing-websites/defining-website-content-structure/managing-page-types/creating-alternative-forms-for-page-types.md)                                                                                                                                                                                                                                                        | Custom tables, Page types, system classes |
| newculture                 | Form used when creating a new culture version of a page.                                                                                                                                                                                                                                                                                                                                                                                                                                                     | Page types                                |
| update                     | Form used when editing an existing item.                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | Custom tables, Page types, system classes |