Generating the Schema
Install the datamodl-codegen program which will convert a JSON schema into python code. Either follow the instructions here or run:
pip install datamodel-code-generator
Then in the iiif-prezi3 code directory run:
datamodel-codegen --input ../../iiif/presentation-validator/schema/iiif_3_0.json --input-file-type jsonschema --use-default --base-class base.Base --output skeleton.py
Replacing the path to your iiif schema file with where ever you have downloaded the iiif_3_0.json file.