File graphml+xml-mime.xml of Package yed
<?xml version="1.0"?> <mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'> <mime-type type="application/x-graphml+xml"> <comment>yEd graphml file (xml format)</comment> <glob pattern="*.graphml"/> <generic-icon name="x-application-graphml+xml"/> </mime-type> </mime-info>