| ''positive number''
| {{Code|2}}
|- valign="top"
| {{Code|indent-attributes}}
| {{Announce|Version 11:}} Indent attributes after the element name, one below the other.
| {{Code|yes}}, {{Code|no}}
| {{Code|false}}
|- valign="top"
| {{Code|newline}}
=Changelog=
;Version 11.0
* Added: Serialization parameter {{Code|indent-attributes}}.
;Version 10.0