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[EP-tech] Search Xapian - value is null

Hello,
I have some questions about search Xapian
Is it possible to do a search Xapian on the set eprint? :
1. Recover only records with a specific field empty?
ex: publisher is null

2. Recover only records with a specific field filled in?
ex: publisher is not null
Thank you in advance

Josée
--
Josée Lessard
Chef de projet Agritrop
CIRAD - DGDRS - Délégation à l'information scientifique et technique
TA 183/05 - Av. Agropolis - 34398 Montpellier cedex 5 (France)