For JSON-LD serialization, default language context MUST be set using @context

[jasnell]

In the original AS 2.0 draft, the default language context was set using the "language" property... e.g.

{
  "language": "en", 
  "displayName": "foo"
}

The only way to do this using a pure JSON-LD approach is to use:

{
  "@context": {"@language": "en"}, 
  "displayName": "foo"
}

[akuckartz]

The relevant part of the JSON-LD spec: http://www.w3.org/TR/json-ld/#string-internationalization

[elf-pavlik]

I think that also relates to ACTION-2: Describe how as2 diverges from json-ld and manages the compatibility since standard JSON-LD parser will not understand information about default language if set outside of @context
I also added note linking to this issue from action in W3C Tracker

[jasnell]

Issue is relatively minor. It just means that we end up having to manually pre- and post-process Natural Language Values by injecting @language tags into Language Maps following JSON-LD expansion.

[elf-pavlik]

Just to collect all such information in one place i started this section on W3C wiki and linked to this issue: https://www.w3.org/wiki/Activity_Streams#JSON-LD

[elf-pavlik]

Found more proper place, my bad with first try!
https://www.w3.org/wiki/Activity_Streams/JSON-LD

[jasnell]

Covered in current editor's draft