validate xmlbody with xsd saved in aws bucket s3

Hi I am new at AWS and python. I am trying to do a post lambda function in AWS that receives the the next json:

{

"xsd_name": "file.xsd",

"service_type": "E",

"version":"1",

"xml_body": "<Mensagge...>"

}

I have the next lambda handler:

def lambda_handler(event, context):

xml_body = BytesIO(event['xml_body'].encode())
xsd_name = event['xsd_name']
service_type = event['service_type']
version = event['version']

print(xml_body)
print(xsd_name)
print(service_type)
print(version)

result = validate('folder/'+ service_type + "/" + version + "/" + xsd_name, xml_body)
return {
    'result': str(result)
}

and a validate function:

def validate(xsd_path, xml_body):
    print(xsd_path)
    s3 = boto3.resource('s3')

    for obj in s3.Bucket(name='BucketFather').objects.filter(Prefix=xsd_path):
       filename = obj.key.split('/')[-1]
       print(filename)
    
    xmlschema = etree.XMLSchema(filename)

    xml_doc = etree.parse(xml_body)
    result = xmlschema.validate(xml_doc)
    if not result:
       result = xmlschema.error_log

    return result

the problem is that I have to go to the budget and get the xsd file name and compare with the xmlbody. But I dont know how to compare them. Could anybody help me? Thanks