function _createEdition(
  uint256 _editionNumber,
  bytes32 _editionData,
  uint256 _editionType,
  uint256 _startDate,
  uint256 _endDate,
  address _artistAccount,
  uint256 _artistCommission,
  uint256 _priceInWei,
  string _tokenURI,
  uint256 _totalAvailable,
  bool _active
) internal returns (bool) {
  // Prevent missing edition number
  require(_editionNumber != 0, "Edition number not provided");

  // Prevent edition number lower than last one used
  require(
    _editionNumber > highestEditionNumber,
    "Edition number must be greater than previously used"
  );

  // Check previously edition plus total available is less than new edition number
  require(
    highestEditionNumber.add(
      editionNumberToEditionDetails[highestEditionNumber].totalAvailable
    ) < _editionNumber,
    "Edition number must be greater than previously used plus total available"
  );

  // Prevent missing types
  require(_editionType != 0, "Edition type not provided");

  // Prevent missing token URI
  require(bytes(_tokenURI).length != 0, "Token URI is missing");

  // Prevent empty artists address
  require(_artistAccount != address(0), "Artist account not provided");

  // Prevent invalid commissions
  require(
    _artistCommission <= 100 && _artistCommission >= 0,
    "Artist commission cannot be greater than 100 or less than 0"
  );

  // Prevent duplicate editions
  require(
    editionNumberToEditionDetails[_editionNumber].editionNumber == 0,
    "Edition already in existence"
  );

  // Default end date to max uint256
  uint256 endDate = _endDate;
  if (_endDate == 0) {
    endDate = MAX_UINT32;
  }

  editionNumberToEditionDetails[_editionNumber] = EditionDetails({
    editionNumber: _editionNumber,
    editionData: _editionData,
    editionType: _editionType,
    startDate: _startDate,
    endDate: endDate,
    artistAccount: _artistAccount,
    artistCommission: _artistCommission,
    priceInWei: _priceInWei,
    tokenURI: _tokenURI,
    totalSupply: 0, // default to all available
    totalAvailable: _totalAvailable,
    active: _active
  });

  // Add to total available count
  totalNumberAvailable = totalNumberAvailable.add(_totalAvailable);

  // Update mappings
  _updateArtistLookupData(_artistAccount, _editionNumber);
  _updateEditionTypeLookupData(_editionType, _editionNumber);

  emit EditionCreated(_editionNumber, _editionData, _editionType);

  // Update the edition pointer if needs be
  highestEditionNumber = _editionNumber;

  return true;
}