Convert JSON-LD to YAML-LD using standard YAML libraries

[pchampin]

As a developer,
I want to be able to convert JSON-LD documents to YAML-LD by simply serializing the document using any standard YAML library,
So that the resulting YAML is valid YAML-LD, resolving to the same graph as the original JSON-LD.

Conversely, I would be very surprised (and annoyed) if such a simple conversion did not work.

This is why, although I do not oppose $-keywords (#11) for authoring YAML-LD from scratch, I want @-keywords to be also supported.

[gkellogg]

Having worked with this, and some standard YAML libraries in Ruby, I think we want to tread lightly and reduce requirements to basic/expanded profile considerations:

In the Basic Profile:

• No use of anchors or alias nodes. Standard JSON types only (YAML JSON Schema) (see Define anchor usage in yaml-ld #13)
• No use of tags or tag definitions (see YAML-LD datatypes (and tags for datatypes) #17)
• Optional document start/end markers
• Optional #YAML 1.2 announcement
• Single document only (see YAML Streams and JSON Sequences #63)

In the Extended Profile:

• Optional use of anchors and alias nodes (finding equivalent nodes may be challenging) (see Define anchor usage in yaml-ld #13)
• Optional multiple documents in stream (after figuring out what this means for us) (see YAML Streams and JSON Sequences #63)
• Optional extended datatypes (Date and DateTimes) (see YAML-LD datatypes (and tags for datatypes) #17)

These should allow the simple use of existing libraries for turning the Internal Representation into YAML with standard controls.

[gkellogg]

This issue was discussed on the Aug 03 meeting.

[gkellogg]

This issue was discussed in the August 17th meeting.

General feel that it can be merged, but more detail is still necessary.

(Really for #70, duplicated there.)