[KecajN]

Pocketbook Inkpad X supports EPUB3 data however it does not always display series information included in metadata. Vendor support is not helpful at all so I am investigating the issue myself.

Series metadata are rarely included in original EPUB3 files so I add them using Calibre. And I have found the following scenarios (no Calibre conversion, only metadata are added):

1. Series information are embedded in the following form:
<meta property="belongs-to-collection" id="id-2">O'Reilly Practical</meta>
<meta refines="#id-2" property="collection-type">series</meta>
<meta refines="#id-2" property="group-position">1</meta>
Pocketbook seems to recognize this type of series metadata. However I have validated it only on a single case because Calibre mostly generates data in a way described in the next point.

2. Series informatio are embedded in the following form:
<opf:meta property="belongs-to-collection" id="id-3">Rizzoli/Isles</opf:meta>
<opf:meta refines="#id-3" property="collection-type">series</opf:meta>
<opf:meta refines="#id-3" property="group-position">12</opf:meta>
Pocketbook is not able to retrieve this kind of metadata - tested on a multiple cases.

I believe that metada in scenario 1 are fully compliant with EPUB3 standard, not sure about item 2.

I have the following questions:

- Is "opf:meta" metadata style valid as EPUB3 metadata?

- Is it possible to force Calibre to create metadata using method no. 1?