<?xml version="1.0" encoding="UTF-8"?><toc><section id="sub-1"><label>1</label><title>Erläuterungen</title></section><section id="sub-2"><label>2</label><title>Schrifttum</title></section><section id="sub-3"><label>3</label><title>Berechnungsbeispiele</title></section></toc>