Discuss impact of 'compactArrays' in JsonLD

[matgnt]

I learned arrays with only 1 element can automatically be processed by the jsonld libs into single objects.
jsonld:
https://www.w3.org/TR/json-ld-api/#the-jsonldoptions-type

Also discussed in EDC here:
eclipse-edc/Connector#3232
and answered there:
eclipse-edc/Connector#3137 (comment)

This is also relevant for what we discussed here already regarding policy property:
#76

Questions are:

• is this desired behavior?
• what is the effect on provided schemas?

--
Matthias Binzer

[matgnt]

Decision in the meeting today:

• jsonld serialization in compact form, with compactArrays=False (meaning, arrays are arrays also with only a single element)
  https://www.w3.org/TR/json-ld-api/#the-jsonldoptions-type
• required profiling jsonld, needs to be a separate section
• also move other profile things (odrl target, etc) into this new profile section (which is in catalog right now)

Also note:

• a property that has not a value it is not included in the message (MUST). empty array means no value, means not included.

[sebbader-sap]

(Comment moved to #132)

[matgnt]

Just because I did some tests with the timestamps, I also tested compactArray with main python library pyld (2.0.3). Unfortunately it seems there is a 5 years old bug in it - not a good indication regarding quality of the library, but anyway, seems there is a problem. It can be worked around, but just to collect library compatibility issues here with profiling ideas.
Reference: digitalbazaar/pyld#61