Hi, I've implemented an OR search for ZCatalog following the HowTos and mailing list postings. However I am still trying to solve the problem that a search result shows up twice when it matches two subsearch criteria. I tried a Python Method "uniq" to make the results of the search unique, but get an error "Error Type: AttributeError Error Value: __hash__". dtml: <dtml-let resa="Catalog(text_obj=begriff)" resb="Catalog(abstract_obj=begriff)" resc="Catalog(title=begriff)" res="resa[:_.len(resa)] + resb[:_.len(resb)] + resc[:_.len(resc)]"> <dtml-in "uniq(items=res)" size=50 start=query_start> ... python method (parameter "items"): d = {} for item in items: d.update( { item: 1 } ) return d.keys() stack trace: ... File /opt2/cvs/Zope2/lib/python/Products/PythonScripts/PythonScript.py, line 337, in _exec (Object: uniq) (Info: ({'script': <PythonScript instance at 8c73b88>, 'context': <Folder instance at 8c95b88>, 'container': <Folder instance at 8968e08>, 'traverse_subpath': []}, (), {'items': [<mybrains instance at 8b215d0>, <mybrains instance at 8c2e778>, ..... File Script (Python), line 5, in uniq .. why can't I iterate over the "items" search results as a normal list? Is there any way to make this work? thanks for your help --Oliver