1. ülesande regulaarne grammatika:

"<"smil">""<"head">""<"layout">""<"root-layout id="[A-Za-z][A-Za-z0-9_]*"/">"
("<"region id="[A-Za-z][A-Za-z0-9_]*"/">")*"<"/layout">""<"/head">""<"body">"
([("<"par">"("<"[img|audio] id="[A-Za-z][A-Za-z0-9_]*"/">")*)*"<"/par">")|("<"seq">"([img|audio] id="[A-Za-z][A-Za-z0-9_]*"/">")*)*"<"/seq">")*"<"/body">""<"/smil">"