<metadata name="author" brief="yes" termlist="yes" merge="longest" rank="2" mergekey="optional" />
<metadata name="subject" merge="unique" termlist="yes" rank="3"/>
<metadata name="id"/>
+ <metadata name="doi" brief="yes"/>
<metadata name="lccn" merge="unique"/>
<metadata name="description" brief="yes" merge="longest" rank="3" />