XMLstarlet to fix image tags and replace path for images

I have multiple .XHTML files in the folder. The top declaration part is as follows: First, I don't want alter top head part. I want process files in batch and fix two things, 1) terminate image end tags properly '/>', same for ` and
` tags. 2) replace path in all images (preserving name), i.e. from to Tried xmlstarlet (v1.6.1), xmlstarlet fo --recover --html file.xhtml but it alters top declaration part, adding extra stuff at the top: Also warns about invalid tag file.xhtml:8.54: Tag section invalid