code: function buildPrefixLabelParts(schema, record) {
    if (isRegion(record.layer) &&
      isGeonamesOrWhosOnFirst(record.source) &&
      isInUSAOrCAN(record)) {
      return [];
    }
  
    if (isCountry(record.layer)) {
      return [];
    }
  
    if (isInKOR(record)) {
      return [];
    }
  
    // support name aliases
    if (Array.isArray(record.name.default)) {
      return record.name.default.slice(0,1);
    }
  
    return [record.name.default];
  
  }
docs: helper function that sets a default label for non-US/CA regions and countries