Hello,
The sxml->xml procedure serializes the empty element always in the "short form", i.e.:

<div/>

having to deal with transformations from xml to html, I needed to get:

<div></div>

so I modified sxml->xml (and element->xml) in simple.scm, to have:

scheme@(guile-user)> (sxml->xml '(*TOP* (tag)) #:closing-tag #t)                                                                                                              
<tag></tag>

default is the old behaviour:

scheme@(guile-user)> (sxml->xml '(*TOP* (tag)))
<tag />

Regards,
Andrea Girotto