Consulta simples com portal_catalog

from Products.CMFCore.utils import getToolByName

pc = getToolByName(context, 'portal_catalog')

query = dict()       
query['review_state'] = 'published'                  
query['portal_type'] = ['Document,']
query['sort_order'] = 'descending'
query['sort_on'] = 'created'
results = pc(query)