> For the complete documentation index, see [llms.txt](https://doc.orbeon.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.orbeon.com/form-runner/api/data-formats/form-definition.md).

# Form definition

## Overview

A Form Runner form is an XHTML document with a few twists. It contains:

* XForms markup following certain patterns
* some extension markup for the view

## General rule

See [Editing the source code of the form definition](/form-builder/advanced/edit-source.md).

## Form definition

### Head

\[IN PROGRESS]

### Body

The standard body of the form looks like this:

```xml
<xh:body>
    <fr:view width="..." appearance="...">
        <fr:body>
            <fr:section>
                ...
            </fr:section>
            <fr:section>
                ...
            </fr:section>
        </fr:body>
        <fr:buttons>...</fr:buttons>
    </fr:view>
</xh:body>
```

The following attributes and elements are optional:

* the `width` attribute on `<fr:view>`
* the `appearance` attribute on `<fr:view>` (reserved for future use)
* the `<fr:buttons>` element

When the `<fr:buttons>` element is present, Form Runner ignores the buttons configured by default for the Detail page, and instead uses the content of the `<fr:buttons>` element.

## Form data

See [Data Format](/form-runner/api/data-formats/form-data.md)

## See also

* [Data Format](/form-runner/api/data-formats/form-data.md)
* [Editing the source code of the form definition](/form-builder/advanced/edit-source.md)