Specifies the system that will serve as the slave for database replication.
For more information, see the topics under "Replicating databases" in the Derby Server and Administration Guide.
This attribute must be specified in conjunction with the startMaster=true attribute. It may be specified in conjunction with the startSlave=true attribute; if it is not, the default value is localhost.
This attribute may be specified only in conjunction with the other attributes permitted with the startMaster=true and startSlave=true attributes.