public String getDomain() {
        return this.domain;
    }
<p>
The Active Directory directory ID to restore the DB instance in. The domain/ must be created prior to this
operation. Currently, you can create only Db2, MySQL, Microsoft SQL Server, Oracle, and PostgreSQL DB instances
in an Active Directory Domain.
</p>
<p>
For more information, see <a
href="https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/kerberos-authentication.html"> Kerberos
Authentication</a> in the <i>Amazon RDS User Guide</i>.
</p>
<p>
This setting doesn't apply to RDS Custom.
</p>

@return The Active Directory directory ID to restore the DB instance in. The domain/ must be created prior to
        this operation. Currently, you can create only Db2, MySQL, Microsoft SQL Server, Oracle, and PostgreSQL
        DB instances in an Active Directory Domain.</p>
        <p>
        For more information, see <a
        href="https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/kerberos-authentication.html"> Kerberos
        Authentication</a> in the <i>Amazon RDS User Guide</i>.
        </p>
        <p>
        This setting doesn't apply to RDS Custom.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/RestoreDBInstanceFromDBSnapshotRequest.java