tests/tei/multiple_tree.xml

<TEI xmlns="http://www.tei-c.org/ns/1.0">
    <teiHeader>
        <refsDecl n="nums" default="true">
            <citeStructure unit="book" match="//body/div" use="@n"/>
        </refsDecl>
        <refsDecl n="alpha">
            <citeStructure unit="book" match="//body/div" use="@xml:id"/>
        </refsDecl>
    </teiHeader>
    <text>
        <body>
            <div xml:id="div-a1" n="I">
                <p>Lorem ipsum dolor sit amet.</p>
            </div>
            <div xml:id="div-002" n="1">
                <p>Consectetur adipiscing elit.</p>
            </div>
            <div xml:id="div-xyz" n="A">
                <p>Sed do eiusmod tempor incididunt.</p>
            </div>
            <div xml:id="div-004" n="4">
                <p>Ut labore et dolore magna aliqua.</p>
            </div>
            <div xml:id="div-v5" n="V">
                <p>Ut enim ad minim veniam.</p>
            </div>
        </body>
    </text>
</TEI>