In policy statements, the URN is used in Principal and Resource elements.
urn:sgws:s3:::bucket-name urn:sgws:s3:::bucket-name/object_key
urn:sgws:identity::account_id:root urn:sgws:identity::account_id:user/user_name urn:sgws:identity::account_id:group/group_name urn:sgws:identity::account_id:federated-user/user_name urn:sgws:identity::account_id:federated-group/group_name
The HTTP request body for the PUT Bucket policy operation must be encoded with charset=UTF-8.