Birth life event profile metadata

Capture birth life event profile metadata in metaItem with about="birth"

metaItem[@about="birth"]


      <metaItem about="birth">
        <metaDescribes predicate="date">1921-05-23</metaDescribes>
        <metaItem about="place"><metaDescribes predicate="institution">St Christopher, Eton College</metaDescribes><metaDescribes predicate="town">Eton</metaDescribes><metaDescribes predicate="county">Buckinghamshire</metaDescribes><metaDescribes predicate="country">England</metaDescribes>
        </metaItem>
      </metaItem>