What is difference between xmpp.domain or xmpp.server.domain?

I use openfire version 3.4.5

Server has the following system properties:

Property Name

Property Value

passwordKey

hidden

plugin.motd.enabled

false

plugin.motd.message

Big Brother is watching.

plugin.motd.subject

Message of the Day

update.lastCheck

1204112115941

update.notify-admins

true

update.proxy.host

proxy

update.proxy.port

3128

update.service-enabled

true

xmpp.audit.active

true

xmpp.audit.days

-1

xmpp.audit.filesize

10

xmpp.audit.iq

true

xmpp.audit.logdir

C:\Program Files (x86)\Openfire\logs

xmpp.audit.logtimeout

120000

xmpp.audit.message

true

xmpp.audit.presence

true

xmpp.audit.totalsize

10000

xmpp.auth.anonymous

true

xmpp.component.defaultSecret

secret

xmpp.component.permission

true

xmpp.component.socket.active

true

xmpp.component.socket.port

5275

xmpp.domain

spica.devel.ardas.dp.ua

xmpp.multiplex.defaultSecret

secret

xmpp.multiplex.socket.active

true

xmpp.producer.hostname

localhost

xmpp.producer.port

5275

xmpp.server.address

localhost

xmpp.server.certificate.verify

false

xmpp.server.domain

spica.devel.ardas.dp.ua

xmpp.session.conflict-limit

0

xmpp.socket.ssl.active

true

Explain me please what is difference between xmpp.domain or xmpp.server.domain? What is destination of these properties?