Interestingly enough ePub 3 standard shows a sample entry for a collection:
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
<dc:title id="t1">The Fellowship of the Ring</dc:title>
<meta refines="#t1" property="title-type">main</meta>
<dc:title id="t2">The Lord of the Rings</dc:title>
<meta refines="#t2" property="title-type">collection</meta>
<meta refines="#t2" property="group-position">1</meta>
<dc:title id="t3">THE LORD OF THE RINGS, Part One: The Fellowship of the Ring</dc:title>
<meta refines="#t3" property="title-type">extended</meta>
…
</metadata>
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