@property
    def recipients_count(self):
        return self.aliasrecipient_set.count()
The DESCRIBE Form in the SPARQL draft is still in state of
dataset/ETHPy150Open tonioo/modoboa/modoboa/admin/models/alias.py/Alias.recipients_count--crossover with--dataset/ETHPy150Open RDFLib/rdfextras/rdfextras/sparql/query.py/Query.describe