Specifies a list of domain names the provider administrator can choose from when assigning domains to business organizations in this provider organization. This list is derived from the domain names specified in the sunPreferredDomain and associatedDomain attributes of the parent or ancestor shared domain node.
If the sunAssignableDomains attribute is not present, all of the sunPreferredDomain and associatedDomain attributes are available to be assigned to business organizations by this provider.