gentoo-overlay/gnome-extra/sushi/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="project">
		<email>gnome@gentoo.org</email>
		<name>Gentoo GNOME Desktop</name>
	</maintainer>
	<use>
		<flag name="office">Support viewing file formats such as generated by
			<pkg>app-office/libreoffice</pkg></flag>
	</use>
</pkgmetadata>