Choose proper XML label for structured payload

Some XML payloads built for requesting REST API are not compatible with syntax.

Sample request from aws-cli:

    aws s3api put-object-acl --bucket some-bucket-name --key some-key --access-control-policy '
    {
        "Grants": [
            {
                "Grantee": {
                    "ID": "3423e6294e24539a765a1430979cc6c619499eeb75ff49a134c851a87998ec28d569965bfbc868db0720ee92ce0cb01b",
                    "Type": "CanonicalUser"
                }, 
                "Permission": "READ"
            }
        ],
        "Owner": {
            "ID": "1a4fa782449409d942e59e1082d3140d67df45d5eb4fffe68e7734519c30c202"
        }
    }'

The following XML payload is expected for this request:
http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUTacl.html#RESTObjectPUTacl-requests

    <AccessControlPolicy>
      <AccessControlList>
        <Grant>
          <Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="CanonicalUser">
            <ID>3423e6294e24539a765a1430979cc6c619499eeb75ff49a134c851a87998ec28d569965bfbc868db0720ee92ce0cb01b</ID>
          </Grantee>
          <Permission>READ</Permission>
        </Grant>
      </AccessControlList>
      <Owner>
        <ID>1a4fa782449409d942e59e1082d3140d67df45d5eb4fffe68e7734519c30c202</ID>
      </Owner>
    </AccessControlPolicy>

but given:

    <AccessControlPolicy>
      <Grants>
        <AccessControlList>
          <Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="CanonicalUser">
            <ID>3423e6294e24539a765a1430979cc6c619499eeb75ff49a134c851a87998ec28d569965bfbc868db0720ee92ce0cb01b</ID>
          </Grantee>
          <Permission>READ</Permission>
        </AccessControlList>
      </Grants>
      <Owner>
        <ID>1a4fa782449409d942e59e1082d3140d67df45d5eb4fffe68e7734519c30c202</ID>
      </Owner>
    </AccessControlPolicy>