Alas, this won't solve my problem, which, to be sure, is neither a Sigil-problem nor an EPUB 3.x-problem. It's an Aldiko-issue. This Reader doesn't recognize the new series-specification. Perhaps in a next release.
Anyway, thanks for all the info, and in the meantime I've found a work-around: I've manually edited the OPF-file (<meta name="..." content="..." /> and that works.
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