Consulta com operadores lógicos com advancedQuery

query=dict()
query['review_state'] = 'published'  
query['portal_type'] = ['Event',]
query['sort_order'] = 'descending'
query['sort_on'] = 'start'
aq = portal_catalog.makeAdvancedQuery(query)
aq &= Ge('start',DateTime()) # Ge:maior ou igual; Le:menor ou igual
return portal_catalog.evalAdvancedQuery(aq)