darran edmundson <dee12-@rsphy1.anu.edu.au> wrote:

3 object are indexed in Year (integer, FieldIndex) 3 object are indexed in Journal (string, FieldIndex) 3 object are indexed in Authors (string, TextIndex)

I am shooting in the dark, but here is one thing that seems not right: your 'Year' index is integer. I think ZCatalog only deals with strings. You may need to change the integer to string. If 'Year' is a property created inside Zope, try to use a string type instead of integer type.

Whereas this one returns an empty result:

<dtml-in "publicationCatalog(Authors='Kivshar',sort_on='Journal')">

and this one causes a key error:

<dtml-in "publicationCatalog(Authors='Kivshar',sort_on='Year')">

I'll do some more experiments later, but first, change the integer to string and see whether this fixes the problem on the 'Year'. Hung Jung ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com