Try to save data type in elements of the instance "Personen"
xmlform.odt (application/vnd.oasis.opendocument.text), 10.10 KB, created by Robert Großkopf on 2018-07-26 13:22:55 UTC
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Creator: Robert Großkopf
Created: 2018-07-26 13:22:55 UTC
Size: 10.10 KB

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Attachments on bug 118954: 143785