[mart-dev] range queries on same field

[David Goodstein]

I have gene family property, which is the number of representatives  
of a particular species in the family.  I'd like to be able to query  
on that property with a range (at least X members and no more than Y  
members).  There is sort of like the transcript_count attribute in  
the EnsMart gene sets, but there it's only a one-sided query (at  
least X transcripts for this gene).  When I try to build a filter  
collection with two filters acting on this members field, one for <=  
and one for >=, I'm unable to export the config (it complains about  
duplicate entries).    Is it not possible to have 2 filters acting on  
the same field?

regards,
-David Goodstein