how to return attribute with more than one value in an access-accept packet?

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Hello, all!
Now I use fr 2.19 for our WiMAX network. It works well now! Thanks for all who have helped us on this maillist.

however, I still have an important question. Our vendor asked us to return some attributes which are listed in WiMAX Forum Standard as return 0-n or 1-n. That is, in a single access-accept packet, there may 2 or 3 value for attribute like "Packet-Flow-Descriptor", "Time-Of-Day-Time". 

I don't know how to achieve this? 

Thanks in advance for your kindly help!
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