gentoo-overlay/mate-base/mate/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="project">
		<email>mate@gentoo.org</email>
		<name>Gentoo MATE Desktop</name>
	</maintainer>
	<use>
		<flag name="base">Install base MATE Desktop applications that are
			recommended for the most common usage; for example, this installs
			the file manager. Disable this and other USE flags if you want a
			more minimal MATE Desktop.</flag>
		<flag name="notification">Force notification daemon to default to MATE's
			notification daemon. Enabled by default. Disable if it causes conflicts
			with other installed desktop environments.</flag>
		<flag name="themes">Install MATE Desktop's themes; if you use other
			themes, you can disable this to spare some space and time.</flag>
		<flag name="extras">Install additional MATE Desktop applications that
			are recommended for extended usage of the MATE Desktop as upstream
			sees it; for example, this installs MATE Desktop's office related
			applications. Disable this if you plan to use your own non-MATE
			Desktop alternatives or a custom mixture of MATE and non-MATE
			packages.</flag>
		<flag name="help">Install <pkg>gnome-extra/yelp</pkg> to handle in application
			help menus and documentation browsing</flag>
	</use>
</pkgmetadata>