[Zope] List from another list in DTML?

Hello All, A form contains data items ['firstname','secondname','dofb' etc] and some "service" fields ['submit','sid','form','nform']. With REQUEST.form.items() all these fields are included in a single list. How can another list be created from the list which contains only data fields? Is it possible with DTML only? -- Best regards, Alexander N. Chelnokov Ural Scientific Institute of Traumatology and Orthopaedics 7, Bankovsky str. Ekaterinburg 620014 Russia ICQ: 25640913