Our Readium and OPDS classes are behind the latest revisions of both. An incomplete list of missing classes and properties. * ~[Accessibility Object](https://github.com/readium/webpub-manifest/blob/master/schema/a11y.schema.json)~ * ~[Alternate Identifiers](https://github.com/readium/webpub-manifest/blob/master/schema/altIdentifier.schema.json)~ * ~[Article](https://github.com/readium/webpub-manifest/blob/master/schema/article.schema.json)~ * ~[Chapter](https://github.com/readium/webpub-manifest/blob/master/schema/chapter.schema.json)~ * ~[Episode](https://github.com/readium/webpub-manifest/blob/master/schema/episode.schema.json)~ * ~[Issue](https://github.com/readium/webpub-manifest/blob/master/schema/issue.schema.json)~ * ~[Periodical](https://github.com/readium/webpub-manifest/blob/master/schema/periodical.schema.json)~ * ~[Season](https://github.com/readium/webpub-manifest/blob/master/schema/season.schema.json)~ * ~[Story Arc](https://github.com/readium/webpub-manifest/blob/master/schema/storyArc.schema.json)~ * ~[Volume](https://github.com/readium/webpub-manifest/blob/master/schema/volume.schema.json)~ * ~[Authentication for OPDS 1.0](https://drafts.opds.io/authentication-for-opds-1.0.html)~ * [Open Distribution to Libraries 1.0](https://drafts.opds.io/odl-1.0.html) * ~[OPDS User Profile 1.0](https://drafts.opds.io/opds-user-profile-1.0.html)~ Some of these needs to be added as properties to the Metadata object.