def iter_field(self, fieldid, prefix = ''):
        
        fieldid = self.schema.to_number(fieldid)
        for fn, t, docfreq, freq in self.iter_from(fieldid, prefix):
            if fn != fieldid:
                return
            yield t, docfreq, freq
List VLANs available, can filter by location and/or network domain
dataset/ETHPy150Open dokipen/whoosh/src/whoosh/reading.py/IndexReader.iter_field--crossover with--dataset/ETHPy150Open apache/libcloud/libcloud/compute/drivers/dimensiondata.py/DimensionDataNodeDriver.ex_list_vlans