Medium in works metadata
Capture the medium of the work in metaItem with about='medium'.
//metaItem[@about='work']/metaItem[@about='medium']
Capture a description of the type of medium in metaDescribes[@predicate='description'].
If a unique id exists for the type of medium, capture in it metaDescribes[@predicate='mediumID'].
<metaItem about="medium">
<metaDescribes predicate="mediumID">x2023971</metaDescribes>
<metaDescribes predicate="description">tin–glazed terracotta</metaDescribes>
</metaItem>