Using xml-ftplugin for Apache conf files

[marc-aurel]

I'd like to use the xml-ftplugin for Apache conf files to jump easily e.g. between Location-start&end-tags. If I switch filetype from apache to xml (:set ft=xml) in vim the xml-ftplugin is correctly loaded and used. But I'd also like to keep my apache-filetype highlighting. So I simply copied after/ftplugin/xml_matchup.vim to after/ftplugin/apache_matchup.vim. But it doesn't work. What did I do wrong resp. what did I forget to make it work?