Many of the Millennium SDK methods require you to pass a list of the Ids for the desired records. You must pass this list of Ids as a well-formatted XML string.
You should format these lists of Ids using the following XML IdList structure.
| 
 <[list name]> <Ids> <Id> 1 </Id> </Ids> <Ids> <Id> 2 </Id> </Ids> </[list name]>  | 
If you are using PHP 5, use the following XML IdList structure:
| MethodName(array("XmlIds"=>'<[list name]><Ids><Id>parameter</Id></Ids></[list name]>')) |