| Name | Type | Description | Required |
|---|---|---|---|
| Id | String | This is simply the file extension, like "doc" or "xml". Do not include the preceding period. | Yes |
| Advertise | YesNoType | Whether this extension is to be advertised. The default is "no". | |
| ContentType | String | The MIME type that is to be written. | |
| Any attribute namespace='##other' processContents='lax' | |||