List the schema level properties used in a JSON schema

schema_properties.py

import os
import json
import jsonref

# From libcove/lib/common.py
class CustomJsonrefLoader(jsonref.JsonLoader):
    '''This ref loader is only for use with the jsonref library
    and NOT jsonschema.'''

    def get_remote_json(self, uri, **kwargs):
        if uri[:4] == 'http':
            return super().get_remote_json(uri, **kwargs)
        else:
            with open(uri) as schema_file:
                return json.load(schema_file, **kwargs)

loader = CustomJsonrefLoader()

def collect_properties(subschema, parent_key=''):
    properties = set()
    for key, val in subschema.items():
        if isinstance(val, dict):
            properties.update(collect_properties(val, key))
        elif isinstance(val, list):
            for x in val:
                if isinstance(x, dict):
                    properties.update(collect_properties(x))
                elif isinstance(x, str):
                    continue
                else:
                    raise NotImplementedError()
    if parent_key != 'properties':
        properties.update(subschema.keys())
    return properties

os.chdir('schema')
schema = jsonref.load(open('bods-package.json'), loader=loader)
for x in sorted(collect_properties(schema)):
    print(x)