Reign profile metadata
Capture reign profile metadata as a date range in metaItem with about="reign".
metaItem[@about='reign']
<metaItem about="reign">
<metaItem about="dates"><metaDescribes predicate="isoStart">1278</metaDescribes><metaDescribes predicate="isoEnd">1318</metaDescribes>
</metaItem>
</metaItem>