Series-specific language level
For a book that is a graded Reader in some series, capture a value in a custom-meta element to indicate its language level.
/book/book-meta/custom-meta-group/custom-meta
Capture a meta-name element containing the value
series-specific-language-level
. Include a second child element
meta-value containing the value supplied by OUP.
<custom-meta-group>
<custom-meta>
<meta-name>series-specific-language-level</meta-name>
<meta-value>6</meta-value>
</custom-meta>
</custom-meta-group>