The majority of .eln-example files does not comply with the requirement of a flattened JSON-LD

[salexan2001]

When using the ro-crate-py package to load the example .eln files I encounter errors like the following in almost all cases:

(...)
  File "(...)/ro-crate-py/rocrate/model/entity.py", line 107, in __setitem__
    raise ValueError(f"no @id in {v}")
ValueError: no @id in {'value': 'Test if everything is working as intended.', 'propertyID': '.objective', 'name': ' → Objective', '@type': 'PropertyValue', 'description': 'What is the objective?'}

I originally thought this was an issue of the ro-crate-py-package and posted an issue there:
ResearchObject/ro-crate-py#202

It turns out that the structure of the .eln-example files does not comply the following RO-Crate-Requirement:

The RO-Crate Metadata File MUST contain RO-Crate JSON-LD; a valid JSON-LD 1.0 document in flattened and compacted form

See: https://www.researchobject.org/ro-crate/specification/1.1/structure.html#ro-crate-metadata-file-ro-crate-metadatajson
and: ResearchObject/ro-crate-py#202

Test report for the .eln-example files:

RSpace-2023-12-08-14-44-xml-SELECTION-c0bEtpHcnNe-HA.eln - ok
export.eln
        no @id in {'@type': 'AggregateRating', 'ratingValue': 4, 'reviewCount': 1}
sampledb_export.eln
        no @id in {'value': 'Measurement', '@type': 'PropertyValue', 'propertyID': 'name', 'name': 'Object Name'}
records-example.eln
        no @id in {'@type': 'PropertyValue', 'additionalType': 'str', 'propertyID': 'type', 'value': 'Measurement'}
Export workbook-2024-08-27-export.eln
        no @id in {'@type': 'Organization', 'name': 'AI4Green', 'slogan': 'AI for Green Chemistry. Electronic Lab Notebook with Machine Learning Support.', 'url': 'https://www.ai4green.app', 'parentOrganization': '#university-of-nottingham'}
PASTA.eln
        no @id in {'value': 'Test if everything is working as intended.', 'propertyID': '.objective', 'name': ' → Objective', '@type': 'PropertyValue', 'description': 'What is the objective?'}
test.eln
        no @id in {'@type': 'TextObject', 'encodingFormat': 'text/plain', 'text': 'JSON export of 00-use-this-record-to-test-chatbot.'}

(So only the RSpace example seems to contain a flattened JSON-LD.)

The validator currently does not check this requirement, but a feature request is already submitted: crs4/rocrate-validator#27