Edit: /usr/share/nano/xml.nanorc (527B)
## Here is an example for XML files.
syntax xml "\.([jrsx]html?|jnlp|mml|pom|rng|sgml?|svg|w[as]dl|wsdd|xjb|xml|xs(d|lt?)|xul)$"
header "<\?xml.*version=.*\?>"
magic "(XML|SGML) (sub)?document"
comment ""
# The entire content of the tag:
color green start="<" end=">"
# The start and the end of the tag:
color cyan "<[^> ]+" ">"
# The strings inside the tag:
color magenta "\"[^"]*\""
# Comments:
color yellow start=""
color yellow start=""
# Escapes:
color red "&[^;]*;"