The portTargetDomainListMembership object is used to create, modify, and delete port target domain lists. Managers can update a port target domain membership list as many times as they want using this object. Setting this object to a new value does not change the current membership nor the values stored in mgmt memory until the object portGroupAction is written with doUpdate. At that time the new values will be written to portTargetDomainListMembership and mgmt memory and the target domain changes will take effect. The portTargetDomainListMembership specifies the target domains that a learning domain belongs to. This set of learning domains is called the port target domain list. The portTargetDomainListMembership is expressed using a shorthand that specifies which learning domains belong in the port target domain list. An example of a specification would be : (2-4,6,8) where commas separate learning domains and hyphens are short-hand for specifying a range of numbers.. This example would map the learning domain to the port target domain list consisting of learning_domains 2, 3, 4, 6, and 8. Valid values for learning domains are 1-8. A port target domain list will read back in a form equivalent to the form written. It may not read back exactly as written.