RDFa schema.org Course issues on Google Search Console

[igobranco]

Bug Report

Problematic Behavior
The Google Search Console complains about missing some information.

Errors / problems:

• Missing field 'offers'
• Missing field 'hasCourseInstance'
• Either 'courseWorkload' or 'courseSchedule' should be specified (in 'hasCourseInstance')

Using https://search.google.com/test/rich-results/result online tool to validate and view the details of RDFa fields crawled by Google.

Expected behavior/code
Missing the courseSchedule https://schema.org/CourseInstance or a courseWorkload.

CourseSchedule
Testing a different MOOC platform using course page link on https://search.google.com/test/rich-results/result:
it shows CourseSchedule example data.

offers
Testing a different MOOC platform using course page link on https://search.google.com/test/rich-results/result:
It shows an offers example data.

Missing field hasCourseInstance
The archived couse pages didn't contains a hasCourseInstance tag.

Steps to Reproduce
Use https://search.google.com/test/rich-results/result tool.

[igobranco]

Google recommends the use of JSON-LD instead of using RDFa, reference: https://developers.google.com/search/docs/appearance/structured-data/intro-structured-data

I also think that generating this information on python would be easier than managing it on tags at the middle of the page.
But this change would be a major change.

[igobranco]

Currently we still have issues on the 'offers'.
After the merge of #2549 then we just need to fix the 'offers'.