class="block">An <code>XATopicSession</code> provides a regular <code>TopicSession</code>. which can
 be used to create <code>TopicSubscriber</code> and <code>TopicPublisher</code> objects
 (optional).
 
 <P>
 The <code>XATopicSession</code> interface is optional. JMS providers are not
 required to support this interface. This interface is for use by JMS
 providers to support transactional environments. Client programs are strongly
 encouraged to use the transactional support available in their environment,