<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def schema_id(origin_did: str, name: str, version: str) -> str: """ Return schema identifier for input origin DID, schema name, and schema version. :param origin_did: DID of schema originator :param name: schema name :param version: schema version :return: schema identifier """


    return '{}:2:{}:{}'.format(origin_did, name, version)