fast, free, validating XML editor - debug

 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.
 .
 This package contains the debugging symbols.