Thanks Bertrand,
just tracked https://issues.apache.org/jira/browse/SLING-5682
> On 20 Apr 2016, at 14:53, Bertrand Delacretaz <[email protected]> wrote:
>
> {
> "title": "The parent node",
> "SLING:ordered": [{
> "SLING:name": "first",
> "title": "This comes first"
> }, {
> "SLING:name": "second",
> "title": "This comes second"
> }]
> }
>
> This needs to be triggered by selector or content-type switch so that
> the existing POST behavior is unchanged.
>
> I suppose having SLING:ordered should then also set the appropriate
> mixin on the parent node.