[basex-talk] How to produce multipart/mixed results with RESTXQ?

I was faintly hoping that a sequence will be magically output as multipart/mixed with appropriate part content types when I annotate it with %rest:produces("multipart/mixed"):

declare %rest:GET %rest:path("/test") %rest:produces("multipart/mixed") function my:test-multipart() { (<ok/>, json:serialize(map{'some':'json'})) };

But the response header says "Content-Type: application/xml", and the result is

<ok/> { "some": "json" }

Are there some other functions or annotations or rest:response elements that I can use in order to get multipart/mixed correctly assembled? Bonus: With the possibility to add file names to each chunk?

Gerrit