[rules-users] Better way to write a constrained collect?

I have the when part of a rule Cluster($ipAddressCollection : ipAddressCollection != null) $ipAddressUsage : IPAddressUsage(guid in (IPAddressUsage.CUSTOMER_MANAGEMENT, IPAddressUsage.CUSTOMER_BACKUP, IPAddressUsage.CUSTOMER_PRODUCTION, IPAddressUsage.CUSTOMER_HEARTBEAT)) java.util.LinkedList(size == 0) from collect( IPAddress(ipAddressUsage == $ipAddressUsage) from $ipAddressCollection.ipAddresses) This works fine, but I would like to constrain the IPAddress's usage within the collect, as opposed to joining. Anyone know if this is possible? thanks dave