extensibility

[danielweck]

Metadata

Via new JSON-LD contexts
Via properties defined by full URIs
Implementation: currently unknown metadata are lost. To make them available would let users of the SDK (i.e. apps, e.g. education) to get them easily without modifying the SDK.
Example: Calibre metadata -> https://readium.org/readium-css/docs/CSS21-epub_compat.html#metadata
An "otherMetadata" array will contain items with property name + value, extracted from the EPUB meta element.

Collections

Expressed as new roles.
If part of our extensions, they are in registries
If not they are full URIs.
An "otherCollections" array will contain items with a role + subCollection.

Links

Extensibility for properties, should be similar to metadata
children and alternate should be part of the core model, not generic extension point

[danielweck]

See https://docs.google.com/document/d/1mHMwJJq3Lypi36bzm3_6LM4wQX8iygdbTTy-S8fya5o/

[danielweck]

See Swift implementation as approved exemplar model: https://github.com/readium/r2-shared-swift/tree/develop/r2-shared-swift/Publication/Web%20Publication