json_xml_simple_schema.py

import json

def schema(json_object):
    if hasattr(json_object, 'items'):
        result = {}
        for k, v in json_object.items():
            if hasattr(v, 'items'):
                result[k] = schema(v)
            elif isinstance(v, list):
                result[k] = [schema(v[0]), '...']
            else:
                result[k] = v.__class__.__name__
        return result
    else:
        return json_object

with open(xml_file, 'r') as f:
    content = f.read()
data = xmltodict.parse(content)
s = schema(data)
print (json.dumps(s, indent=4))