I've compared the list of elements in the "Chapter 48. Configuration Reference" with xsd file of hornetq-jms.xml from HQ trunk and found out that there are some elements, i.e. configuration properties, that does not have any description in the docs.

A. There is a list of elements that are not documented anywhere in the HornetQ User Guide:
jmx-domain
connection-factory.xa
connection-factory.compress-large-messages
connection-factory.group-id
queue.selector

B. There is a list of elements documented in the HornetQ User Guide, but not enlisted in the Chapter 48.1.2.:
connection-factory.ha

All those elements are related to hornetq-jms.xml.