How can i get the search results in xml in wordpress

Hello is it possible to get the search results in xml (because i need the response data in xml as well)
I’m using simple fields and would like to search based on thoose functions

I’m going to hire someone to code an app, and he wrote.
”But I will need a web service that will provide response based on the search query request from mobile. Response data can be either in xml or json.”