Install xmlcopyeditor by entering the following commands in the terminal:
sudo apt update sudo apt install xmlcopyeditor
Description:
fast, free, validating XML editor
XML Copy Editor is an XML editor focusing on editing document markup languages like DITA, DocBook, WordprocessingML. It features DTD/XML Schema/RELAX NG validation, XSLT, XPath, pretty-printing, syntax highlighting, folding, tag completion/locking, and a spelling/style check.
Homepage: http://xml-copy-editor.sourceforge.net/
Version: 1.2.1.3-1build2
Section: universe/devel