gentoo-overlay/media-video/cheese/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<herd>gnome</herd>
	<longdescription lang="en">
		Cheese uses your webcam to take photos and videos, applies fancy special
		effects, and lets you share the fun with others.
	</longdescription>
</pkgmetadata>