[Zope] Modifying form input which is passed as a record

Hi, I have a form that passes info as a record with the following type of info: [a: 'bob', b: 'silver', a: 'trev', b: 'gold', a: 'nig', b: 'bronze', a:'lee', b:'gold'] I want to work thru this info and pick out all the records with a key 'b' equal to 'gold'. I want to place this into a new key-value record (or list?) to use later. So it would create: [a: 'trev', b: 'gold', a:'lee', b:'gold'] I cant work out how to do this. My main problem is inserting key names to make the key-value pairs. I have got around this by creating a list within a list but this has no keys: [ ['trev','gold'], ['lee','gold'] ] Thanks for any ideas. Richard