# Page Not Found

The URL `form-builder/extension-api.html` does not exist.

You might be looking for one of these pages:
- [Validation functions](https://doc.orbeon.com/contributors/extension-validation.md)
- [Form editor](https://doc.orbeon.com/form-builder/form-editor.md)
- [Form localization](https://doc.orbeon.com/form-builder/localization.md)
- [Extension API](https://doc.orbeon.com/form-builder/advanced/extensibility/extension-api.md)
- [Extensibility](https://doc.orbeon.com/form-builder/advanced/extensibility.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://doc.orbeon.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://doc.orbeon.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/contributors/extension-validation.md`)
- Use `Accept: text/markdown` header for content negotiation