Metadata for web PDF
If a book is accompanied by a web PDF, add a reference to the PDF file name in the book's metadata.
/book/bookMeta/metaItem[@about = "book"]/metaDescribes[@predicate = "webPDF"]
Include the .pdf extension in the metadata value.
<metaDescribes predicate="webPDF">9780197543030_WEB.pdf</metaDescribes>