Владимир

Дмитрий, спасибо за ссылку. Разобрался и допилил функционал, как хотел. Привожу код, возможно кому-нибудь пригодится

import os
import sys
import datetime
from lxml import etree

rootDir = os.path.dirname(sys.argv[0])
scheme = '{}\\{}'.format(rootDir, 'ListForRating_v03\ListForRating_v03.xsd')
pathToXML = '{}\\{}'.format(rootDir, 'xml')


class Validator:

    def __init__(self, xsd_path: str):
        xmlschema_doc = etree.parse(xsd_path)
        self.xmlschema = etree.XMLSchema(xmlschema_doc)

    def validate(self, xml_path: str) -> str:
        xml_doc = etree.parse(xml_path)
        try:
            self.xmlschema.assertValid(xml_doc)
            return 'Valid! :)'
        except etree.DocumentInvalid as e:
            msg = 'Not valid! :( Errors save in errors.log:'
            with open('errors.log', 'a') as f:
                for error in self.xmlschema.error_log:
                    f.write('File name: {} Error: {} Line: {}.\n'.format(os.path.basename(xml_path), error.message, error.line))
            return msg

validator = Validator(scheme)

Files = os.listdir(pathToXML)
t = 'files' if len(Files) > 1 else 'file'
print('Scanning %s %s' % (len(Files), t))
timeBegin = datetime.datetime.now()
for file_name in Files:
    print('{}: '.format(file_name), end='')
    file_path = '{}\\{}'.format(pathToXML, file_name)
    print(validator.validate(file_path))
timeEnd = datetime.datetime.now()
delta = timeEnd - timeBegin