Example: metadata variation
nSample
date values
<date>2-12-01</date>
<date>2002-01-01</date>
<date>0000-00-00</date>
<date>1822</date>
<date>between
1827 and 1833</date>
<date>18--?</date>
<date>November
13, 1947</date>
<date>SEP
1958</date>
<date>235
bce</date>
<date>Summer,
1948</date>