<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT annotation (head, body)>
<!ELEMENT attribute (#PCDATA)>
<!ATTLIST attribute
	name CDATA #REQUIRED
>
<!ELEMENT body (track+)>
<!ELEMENT comment (#PCDATA)>
<!ELEMENT el (#PCDATA | attribute | comment)*>
<!ATTLIST el
	index CDATA #REQUIRED
	start CDATA #REQUIRED
	end CDATA #REQUIRED
>
<!ELEMENT head (specification, video)>
<!ELEMENT specification EMPTY>
<!ATTLIST specification
	src CDATA #REQUIRED
>
<!ELEMENT track (el*)>
<!ATTLIST track
	name CDATA #REQUIRED
	type CDATA #REQUIRED
>
<!ELEMENT video EMPTY>
<!ATTLIST video
	src CDATA #REQUIRED
>