Circa in profile metadata dates
Insert a metaDescribes with predicate="circa" and value yes when capturing a date associated with the key word "circa".
Circa dates will contain the keyword 'circa' or 'c' near or next to a date.
Example of a 'circa' date
c1900
<metaDescribes predicate="date">1900</metaDescribes>
<metaDescribes predicate="circa">yes</metaDescribes>