code: func (r Dns_Domain_Registration) LookupDomain(domainName *string) (resp []datatypes.Container_Dns_Domain_Registration_Lookup, err error) {
  	params := []interface{}{
  		domainName,
  	}
  	err = r.Session.DoRequest("SoftLayer_Dns_Domain_Registration", "lookupDomain", params, &r.Options, &resp)
  	return
  }
docs: // The lookupDomain method checks whether a specified domain name is available for registration in TLD's, and suggests other similar domain names, and checks whether they are available as well.