IS XS webAs lean java server

Hello Everyone,

The architectur eof hana system shows a WebAs server refererred to as XS engine.

I would like to know if this XS is present even in Hana Cloud platform as I read that the applications on cloud are deployed on a lean java server.

I just want to be sure if XS weAs is a lean java server and if  hana has exactly same architecture even in cloud except for size of h/w.

Regards,

Pooja M