JLayouts tag for installers. For example:

...
	</media>
	
	<!-- JLayout files -->
	<layouts destination="com_anymail" folder="layouts">
		<folder>css</folder>
		<folder>images</folder>
		<folder>js</folder>
		<filename>index.html</filename>
	</layouts>	

	<!-- Administrator back-end section -->
	<administration>
....