[cl-who-devel] Parsing html and creating a new output

I am using drakma to get the html and cl-html-parse to parse it. Let's say I need to parse and modify the html and use hunchentoot to handle the request giving out the new html. In cl-who I see only the macro with-html-output-to-string which prints html given a body of s-exp. In my case I will only have a list of s-exp like '(:div "some text"). If I give a list to with-html-output-to-string it will return an empty string. I am wondering is there a function inside cl-who that I can use to convert s-exp html list like '(:body "some body") to an HTML text? Or how can I use the with-html-output-to-string macro for the purpose?

Thank you, Andrew